NAME

Regexp::Common::Apache2 - Apache2 Expressions

SYNOPSIS

use Regexp::Common qw( Apache2 );
use Regexp::Common::Apache2 qw( $ap_true $ap_false );

while( <> )
{
    my $pos = pos( $_ );
    /\G$RE{Apache2}{Word}/gmc      and  print "Found a word expression at pos $pos\n";
    /\G$RE{Apache2}{Variable}/gmc  and  print "Found a variable $+{varname} at pos $pos\n";
}

# Override Apache2 expressions by the legacy ones
$RE{Apache2}{-legacy => 1}
# or use it with the Legacy prefix:
if( $str =~ /^$RE{Apache2}{LegacyVariable}$/ )
{
    print( "Found variable $+{variable} with name $+{varname}\n" );
}

VERSION

v0.2.1

DESCRIPTION

This is the perl port of Apache2 expressions

The regular expressions have been designed based on Apache2 Backus-Naur Form (BNF) definition as described below in "APACHE2 EXPRESSION"

You can also use the extended pattern by calling Regexp::Common::Apache2 like:

$RE{Apache2}{-legacy => 1}

All of the regular expressions use named capture. See "%+" in perlvar for more information on named capture.

APACHE2 EXPRESSION

comp

BNF:

stringcomp
| integercomp
| unaryop word
| word binaryop word
| word "in" listfunc
| word "=~" regex
| word "!~" regex
| word "in" "{" words "}"

$RE{Apache2}{Comp}

For example:

"Jack" != "John"
123 -ne 456
# etc

This uses other expressions namely "stringcomp", "integercomp", "word", "listfunc", "regex", "words"

The capture names are:

comp

Contains the entire capture block

comp_binary

Matches the expression that uses a binary operator, such as:

==, =, !=, <, <=, >, >=, -ipmatch, -strmatch, -strcmatch, -fnmatch

comp_binaryop

The binary op used if the expression is a binary comparison. Binary operator is:

==, =, !=, <, <=, >, >=, -ipmatch, -strmatch, -strcmatch, -fnmatch

comp_integercomp

When the comparison is for an integer comparison as opposed to a string comparison.

comp_list

Contains the list used to check a word against, such as:

"Jack" in {"John", "Peter", "Jack"}

comp_listfunc

This contains the listfunc when the expressions contains a word checked against a list function, such as:

"Jack" in listMe("some arguments")

comp_regexp

The regular expression used when a word is compared to a regular expression, such as:

"Jack" =~ /\w+/

Here, comp_regexp would contain /\w+/

comp_regexp_op

The regular expression operator used when a word is compared to a regular expression, such as:

"Jack" =~ /\w+/

Here, comp_regexp_op would contain =~

comp_stringcomp

When the comparison is for a string comparison as opposed to an integer comparison.

comp_unary

Matches the expression that uses unary operator, such as:

-d, -e, -f, -s, -L, -h, -F, -U, -A, -n, -z, -T, -R

For example:

-A /some/uri.html # (same as -U)
-d /some/folder # file is a directory
-e /some/folder/file.txt # file exists
-f /some/folder/file.txt # file is a regular file
-F /some/folder/file.txt # file is a regular file and is accessible to all (Apache2 does a sub query to check)
-h /some/folder/link.txt # true if file is a symbolic link
-n %{QUERY_STRING} # true if string is not empty (opposite of -z)
-s /some/folder/file.txt # true if file is not empty
-L /some/folder/link.txt # true if file is a symbolic link (same as -h)
-R 192.168.1.1/24 # remote ip match this ip block; same as %{REMOTE_ADDR} -ipmatch 192.168.1.1/24
-T %{HTTPS} # false if string is empty, "0", "off", "false", or "no" (case insensitive). True otherwise.
-U /some/uri.html # check if the uri is accessible to all (Apache2 does a sub query to check)
-z %{QUERY_STRING} # true if string is empty (opposite of -n)

comp_word

Contains the word that is the object of the comparison.

comp_word_in_list

Contains the expression of a word checked against a list, such as:

"Jack" in {"John", "Peter", "Jack"}

comp_word_in_listfunc

Contains the word when it is being compared to a listfunc, such as:

"Jack" in listMe("some arguments")

comp_word_in_regexp

Contains the expression of a word checked against a regular expression, such as:

"Jack" =~ /\w+/

Here the word Jack (without the parenthesis) would be captured in comp_word

comp_worda

Contains the first word in comparison expression

comp_wordb

Contains the second word in comparison expression

cond

BNF:

"true"
| "false"
| "!" cond
| cond "&&" cond
| cond "||" cond
| comp
| "(" cond ")"

$RE{Apache2}{Cond}

For example:

use Regexp::Common::Apache qw( $ap_true $ap_false );
($ap_false && $ap_true)

The capture names are:

cond

Contains the entire capture block

cond_and

Contains the expression like:

($ap_true && $ap_true)

cond_and_expr1

The first expression in a ANDed condition, such as :

$ap_true && $ap_false

cond_and_expr2

The second expression in a ANDed condition, such as :

$ap_true && $ap_false

cond_comp

Contains the comparison expression. See "comp" above.

cond_expr

Expression that is capture after following a negatiion, such as :

!-e /some/folder/file.txt

Here cond_expr would contain -e /some/folder/file.txt

cond_false

Contains the false expression like:

($ap_false)
false # as a litteral word
0 # 0 as a standalone number not surrounded by any number or letter

cond_neg

Contains the expression if it is preceded by an exclamation mark, such as:

!$ap_true

cond_or

Contains the expression like:

($ap_true || $ap_true)

cond_or_expr1

The first expression in a ORed condition, such as :

$ap_true && $ap_false

cond_or_expr2

The second expression in a ORed condition, such as :

$ap_true && $ap_false

cond_parenthesis

Contains the condition when it is embedded within parenthesis.

cond_true

Contains the true expression like:

($ap_true)
true # as a litteral word
1 # 1 as a standalone number not surrounded by any number or letter

expr

BNF: cond | string

$RE{Apache2}{Expr}

The capture names are:

expr: Contains the entire capture block
expr_cond: Contains the expression of the condition
expr_string: Contains the expression of a string

function

BNF: funcname "(" words ")"

$RE{Apache2}{Function}

For example:

base64("Some string")
someFunc()
md5(  "one arg" )
otherFunc( %{some_var}, "quoted", split( /\w+/, "John Paul" ) )

The capture names are:

function: Contains the entire capture block
func_args: Contains the list of arguments. In the example above, this would be Some string
func_name: The name of the function . In the example above, this would be base64

integercomp

BNF:

word "-eq" word | word "eq" word
| word "-ne" word | word "ne" word
| word "-lt" word | word "lt" word
| word "-le" word | word "le" word
| word "-gt" word | word "gt" word
| word "-ge" word | word "ge" word

$RE{Apache2}{IntegerComp}

For example:

123 -ne 456
789 gt 234
# etc

The hyphen before the operator is optional, so you can say eq instead of -eq

The capture names are:

stringcomp: Contains the entire capture block
integercomp_op: Contains the comparison operator
integercomp_worda: Contains the first word in the string comparison
integercomp_wordb: Contains the second word in the string comparison

listfunc

BNF: listfuncname "(" words ")"

$RE{Apache2}{ListFunc}

For example:

base64("Some string")
someFunc()
md5(  "one arg" )
otherFunc( %{some_var}, "quoted", split( /\w+/, "John Paul" ) )

This is quite similar to the "function" regular expression

The capture names are:

listfunc: Contains the entire capture block
func_args: Contains the list of arguments. In the example above, this would be Some string
func_name: The name of the function . In the example above, this would be base64

regex

BNF:

"/" regpattern "/" [regflags]
| "m" regsep regpattern regsep [regflags]

$RE{Apache2}{Regexp}

For example:

/\w+/i
# or
m,\w+,i

The capture names are:

regex

Contains the entire capture block

regflags

The regular expression modifiers. See perlre

This can be any combination of:

i, s, m, g

regpattern

Contains the regular expression. See perlre for example and explanation of how to use regular expression. Apache2 uses PCRE, i.e. perl compliant regular expressions.

regsep

Contains the regular expression separator, which can be any of:

/, #, $, %, ^, |, ?, !, ', ", ",", ;, :, ".", _, -

string

BNF: substring | string substring

$RE{Apache2}{String}

For example:

URI accessed is: %{REQUEST_URI}

The capture names are:

string: Contains the entire capture block

stringcomp

BNF:

word "==" word
| word "!=" word
| word "<"  word
| word "<=" word
| word ">"  word
| word ">=" word

$RE{Apache2}{StringComp}

For example:

"John" == "Jack"
sub(s/\w+/Jack/i, "John") != "Jack"
# etc

The capture names are:

stringcomp: Contains the entire capture block
stringcomp_op: Contains the comparison operator
stringcomp_worda: Contains the first word in the string comparison
stringcomp_wordb: Contains the second word in the string comparison

substring

BNF: cstring | variable | rebackref

$RE{Apache2}{Substring}

For example:

Jack
# or
%{REQUEST_URI}

See "variable" and "word" regular expression for more on those.

The capture names are:

rebackref: Contains a regular expression back reference such as $1, $2, etc up to $9
substring: Contains the entire capture block

variable

BNF:

"%{" varname "}"
| "%{" funcname ":" funcargs "}"
| "v(" varname ")"

$RE{Apache2}{Variable}
# or to enable legacy variable:
$RE{Apache2}{LegacyVariable}

For example:

%{REQUEST_URI}
# or
%{md5:"some string"}
# or
v(REQUEST_URI)
# legacy variable allows extended variable. See LEGACY APACHE2 EXPRESSION below

See "word" and "cond" regular expression for more on those.

The capture names are:

variable: Contains the entire capture block
var_func: Contains the text for the function and its arguments if this is a function.
var_func_args: Contains the function arguments.
var_func_name: Contains the function name.
varname: Contains the variable name without the percent sign or dollar sign (if legacy regular expression is enabled) or the possible surrounding accolades

word

BNF:

digits
| "'" string "'"
| '"' string '"'
| word "." word
| variable
| function
| "(" word ")"
| rebackref

$RE{Apache2}{Word}

This is the most complex regular expression used, since it uses all the others and can recurse deeply

For example:

12
# or
"John"
# or
'Jack'
# or
%{REQUEST_URI}
# or
%{HTTP_HOST}.%{HTTP_PORT}
# or
md5("some string")
# or any word surrounded by parenthesis, such as:
("John")

See "string", "word", "variable", "function" regular expression for more on those.

The capture names are:

rebackref: Contains a regular expression back reference such as $1, $2, etc up to $9
word: Contains the entire capture block
word_digits: If the word is actually digits, ths contains those digits.
word_dot_word: This contains the text when two words are separated by a dot.
word_enclosed: Contains the value of the word enclosed by single or double quotes or by surrounding parenthesis.
word_function: Contains the word containing a "function"
word_quote: If the word is enclosed by single or double quote, this contains the single or double quote character
word_variable: Contains the word containing a "variable"

words

BNF:

word
| word "," word

$RE{Apache2}{Words}

For example:

"Jack"
# or
"John", "Peter", "Paul"

See "word" and "list" regular expression for more on those.

The capture names are:

words: Contains the entire capture block
words_word: Contains the word
words_list: Contains the list

ADVANCED APACHE2 EXPRESSION

comp

BNF:

stringcomp
| integercomp
| unaryop word
| word binaryop word
| word "in" listfunc
| word "=~" regex
| word "!~" regex
| word "in" "{" list "}"

$RE{Apache2}{TrunkComp}

For example:

"Jack" != "John"
123 -ne 456
# etc

This uses other expressions namely "stringcomp", "integercomp", "word", "listfunc", "regex", "list"

This is similar to the regular "comp" in "APACHE2 EXPRESSION", except it uses "list" instead of "words"

The capture names are:

comp

Contains the entire capture block

comp_binary

Matches the expression that uses a binary operator, such as:

==, =, !=, <, <=, >, >=, -ipmatch, -strmatch, -strcmatch, -fnmatch

comp_binaryop

The binary op used if the expression is a binary comparison. Binary operator is:

==, =, !=, <, <=, >, >=, -ipmatch, -strmatch, -strcmatch, -fnmatch

comp_integercomp

When the comparison is for an integer comparison as opposed to a string comparison.

comp_list

Contains the list used to check a word against, such as:

"Jack" in {"John", "Peter", "Jack"}

comp_listfunc

This contains the listfunc when the expressions contains a word checked against a list function, such as:

"Jack" in listMe("some arguments")

comp_regexp

The regular expression used when a word is compared to a regular expression, such as:

"Jack" =~ /\w+/

Here, comp_regexp would contain /\w+/

comp_regexp_op

The regular expression operator used when a word is compared to a regular expression, such as:

"Jack" =~ /\w+/

Here, comp_regexp_op would contain =~

comp_stringcomp

When the comparison is for a string comparison as opposed to an integer comparison.

comp_unary

Matches the expression that uses unary operator, such as:

-d, -e, -f, -s, -L, -h, -F, -U, -A, -n, -z, -T, -R

comp_word

Contains the word that is the object of the comparison.

comp_word_in_list

Contains the expression of a word checked against a list, such as:

"Jack" in {"John", "Peter", "Jack"}

comp_word_in_listfunc

Contains the word when it is being compared to a listfunc, such as:

"Jack" in listMe("some arguments")

comp_word_in_regexp

Contains the expression of a word checked against a regular expression, such as:

"Jack" =~ /\w+/

Here the word Jack (without the parenthesis) would be captured in comp_word

comp_worda

Contains the first word in comparison expression

comp_wordb

Contains the second word in comparison expression

cond

BNF:

"true"
| "false"
| "!" cond
| cond "&&" cond
| cond "||" cond
| comp
| "(" cond ")"

$RE{Apache2}{TrunkCond}

Same as "cond" in "APACHE2 EXPRESSION"

expr

BNF: cond | string

$RE{Apache2}{TrunkExpr}

Same as "cond" in "APACHE2 EXPRESSION"

function

BNF: funcname "(" words ")"

$RE{Apache2}{TrunkFunction}

Same as "cond" in "APACHE2 EXPRESSION"

integercomp

BNF:

word "-eq" word | word "eq" word
| word "-ne" word | word "ne" word
| word "-lt" word | word "lt" word
| word "-le" word | word "le" word
| word "-gt" word | word "gt" word
| word "-ge" word | word "ge" word

$RE{Apache2}{TrunkIntegerComp}

Same as "cond" in "APACHE2 EXPRESSION"

join

BNF:

"join" ["("] list [")"]
| "join" ["("] list "," word [")"]

$RE{Apache2}{TrunkJoin}

For example:

join({"word1" "word2"})
# or
join({"word1" "word2"}, ', ')

This uses "list" and "word"

The capture names are:

join: Contains the entire capture block
join_list: Contains the value of the list
join_word: Contains the value for word used to join the list

list

BNF:

split
| listfunc
| "{" words "}"
| "(" list ")

$RE{Apache2}{TrunkList}

For example:

split( /\w+/, "Some string" )
# or
{"some", "words"}
# or
(split( /\w+/, "Some string" ))
# or
( {"some", "words"} )

This uses "split", "listfunc", words and "list"

The capture names are:

list: Contains the entire capture block
list_func: Contains the value if a "listfunc" is used
list_list: Contains the value if this is a list embedded within parenthesis
list_split: Contains the value if the list is based on a split
list_words: Contains the value for a list of words.

listfunc

BNF: listfuncname "(" words ")"

$RE{Apache2}{TrunkListFunc}

Same as "cond" in "APACHE2 EXPRESSION"

regany

BNF: regex | regsub

$RE{Apache2}{TrunkRegany}

For example:

/\w+/i
# or
m,\w+,i

This regular expression includes "regany" and "regsub"

The capture names are:

regany: Contains the entire capture block
regany_regex: Contains the regular expression. See "regex"
regany_regsub: Contains the substitution regular expression. See "regsub"

regex

BNF:

"/" regpattern "/" [regflags]
| "m" regsep regpattern regsep [regflags]

$RE{Apache2}{TrunkRegexp}

Same as "cond" in "APACHE2 EXPRESSION"

regsub

BNF: "s" regsep regpattern regsep string regsep [regflags]

$RE{Apache2}{TrunkRegsub}

For example:

s/\w+/John/gi

The capture names are:

regflags

The modifiers used which can be any combination of:

i, s, m, g

See perlre for an explanation of their usage and meaning

regstring

The string replacing the text found by the regular expression

regsub

Contains the entire capture block

regpattern

Contains the regular expression which is perl compliant since Apache2 uses PCRE.

regsep

Contains the regular expression separator, which can be any of:

/, #, $, %, ^, |, ?, !, ', ", ",", ;, :, ".", _, -

split

BNF:

"split" ["("] regany "," list [")"]
| "split" ["("] regany "," word [")"]

$RE{Apache2}{TrunkSplit}

For example:

split( /\w+/, "Some string" )

This uses "regany", "list" and "word"

The capture names are:

split: Contains the entire capture block
split_regex: Contains the regular expression used for the split
split_list: The list being split. It can also be a word. See below
split_word: The word being split. It can also be a list. See above

string

BNF: substring | string substring

$RE{Apache2}{TrunkString}

Same as "cond" in "APACHE2 EXPRESSION"

stringcomp

BNF:

word "==" word
| word "!=" word
| word "<"  word
| word "<=" word
| word ">"  word
| word ">=" word

$RE{Apache2}{TrunkStringComp}

Same as "cond" in "APACHE2 EXPRESSION"

sub

BNF: "sub" ["("] regsub "," word [")"]

$RE{Apache2}{TrunkSub}

For example:

sub(s/\w/John/gi,"Peter")

The capture names are:

sub

Contains the entire capture block

sub_regsub

Contains the substitution expression, i.e. in the example above, this would be:

s/\w/John/gi

sub_word

The target for the substitution. In the example above, this would be "Peter"

substring

BNF: cstring | variable

$RE{Apache2}{TrunkSubstring}

For example:

Jack
# or
%{REQUEST_URI}
# or
%{:sub(s/\b\w+\b/Peter/, "John"):}

See "variable" and "word" regular expression for more on those.

This is different from "substring" in "APACHE2 EXPRESSION" in that it does not include regular expression back reference, i.e. $1, $2, etc.

The capture names are:

substring: Contains the entire capture block

variable

BNF:

"%{" varname "}"
| "%{" funcname ":" funcargs "}"
| "v('" varname "')"
| "%{:" word ":}"
| "%{:" cond ":}"
| rebackref

$RE{Apache2}{TrunkVariable}

For example:

%{REQUEST_URI}
# or
%{md5:"some string"}
# or
%{:sub(s/\b\w+\b/Peter/, "John"):}
# or a reference to previous regular expression capture groups
$1, $2, etc..

See "word" and "cond" regular expression for more on those.

The capture names are:

rebackref

Contains the regular expression back reference such as $1, $2, etc

But without the leading dollar sign nor the enclosing accolade, if any, thus in the example of $1 or ${1} rebackref would be 1

variable

Contains the entire capture block

var_backref

Contains the regular expression back reference such as $1, $2, etc

This includes the leadaing dollar sign and any enclosing accolade, if any, such as ${1}

var_cond

If this is a condition inside a variable, such as:

%{:$ap_true == $ap_false}

var_func

Contains the text for the function and its arguments if this is a function.

var_func_args

Contains the function arguments.

var_func_name

Contains the function name.

var_word

A variable containing a word. See "word" for more information about word expressions.

varname

Contains the variable name without the percent sign or dollar sign (if legacy regular expression is enabled) or the possible surrounding accolades

word

BNF:

digits
| "'" string "'"
| '"' string '"'
| word "." word
| variable
| sub
| join
| function
| "(" word ")"

$RE{Apache2}{TrunkWord}

This is the most complex regular expression used, since it uses all the others and can recurse deeply

For example:

12
# or
"John"
# or
'Jack'
# or
%{REQUEST_URI}
# or
%{HTTP_HOST}.%{HTTP_PORT}
# or
%{:sub(s/\b\w+\b/Peter/, "John"):}
# or
sub(s,\w+,Paul,gi, "John")
# or
join({"Paul", "Peter"}, ', ')
# or
md5("some string")
# or any word surrounded by parenthesis, such as:
("John")

See "string", "word", "variable", "sub", "join", "function" regular expression for more on those.

The capture names are:

word: Contains the entire capture block
word_digits: If the word is actually digits, thise contains those digits.
word_dot_word: This contains the text when two words are separated by a dot.
word_enclosed: Contains the value of the word enclosed by single or double quotes or by surrounding parenthesis.
word_function: Contains the word containing a "function"
word_join: Contains the word containing a "join"
word_quote: If the word is enclosed by single or double quote, this contains the single or double quote character
word_sub: If the word is a substitution, this contains tha substitution
word_variable: Contains the word containing a "variable"

words

BNF:

word
| word "," list

$RE{Apache2}{TrunkWords}

For example:

"Jack"
# or
"John", {"Peter", "Paul"}
# or
sub(s/\b\w+\b/Peter/, "John"), {"Peter", "Paul"}

See "word" and "list" regular expression for more on those.

It is different from "words" in "APACHE2 EXPRESSION" in that it uses "list" instead of "word"

The capture names are:

words: Contains the entire capture block
words_word: Contains the word
words_list: Contains the list

LEGACY

When using legacy mode, the regular expressions are more laxed in what they accept around 3 types of expressions:

1. comp

Same as "comp", and it extends it by adding support for legacy regular expression, i.e. without using the tilde (~). For example :

$HTTP_COOKIES = /lang\%22\%3A\%22([a-zA-Z]+\-[a-zA-Z]+)\%22\%7D;?/

In current version of Apache2 expression this would rather be writen as:

%{HTTP_COOKIES} =~ /lang\%22\%3A\%22([a-zA-Z]+\-[a-zA-Z]+)\%22\%7D;?/

Both are supported in legacy expressions.

The additional capture groups available are:

comp_in_regexp_legacy: Contains the entire legacy regular expression.
comp_regexp (unchanged): Contains the regular expression.
comp_regexp_op: Contains the operator, which may be =, or ==, or !=
comp_word (unchanged): Contains the word being compared

2. cond

It is the same as "cond", except it also accepts a vanilla variable as valid condition, such as: $REQUEST_URI, so that expression as below would work :

!$REQUEST_URI

It adds the following capture groups:

cond_variable: Contains the variable used in the condition, including the leading dollar or percent sign and possible surrounding accolades.

3. variable

Same as "variable", but is extended to accept vanilla variable such as $REQUEST_URI. In current Apache2 expressions, a variable is anoted by using percent sign and potentially surounding it with accolades. For example :

%{REQUEST_URI}

Also legacy variable includes regular expression back reference such as $1, $2, etc.

Its capture groups names are:

variable: Contains the entire variable.
varname: Contains the variable name without dollar or percent sign no possible surrounding accolades.
var_backref: The regular expression back reference including the dollar sign and possible surrounding accolades. For example: $1 or ${1}
rebackref: The regular expression back reference excluding the dollar sign and possible surrounding accolades. For example: $1 or ${1} would mean rebackref would contain 1
var_func_name: The variable-embedded function name
var_func_args: The variable-embedded function arguments

4. word

word is extended to also accept a regular expression back refernece such as $1, $2, etc.

CAVEAT

Functions need to have their arguments enclosed in parenthesis. For example:

%{REMOTE_ADDR} -in split s/.*?IP Address:([^,]+)/$1/, PeerExtList('subjectAltName')

will not work, but the following will:

%{REMOTE_ADDR} -in split(s/.*?IP Address:([^,]+)/$1/, PeerExtList('subjectAltName'))

Maybe this will be adjusted in future versions.

CHANGES & CONTRIBUTIONS

Feel free to reach out to the author for possible corrections, improvements, or suggestions.

AUTHOR

Jacques Deguest <jack@deguest.jp>

COPYRIGHT & LICENSE

You can use, copy, modify and redistribute this package and associated files under the same terms as Perl itself.

To install Regexp::Common::Apache2, copy and paste the appropriate command in to your terminal.

cpanm

cpanm Regexp::Common::Apache2

CPAN shell

perl -MCPAN -e shell
install Regexp::Common::Apache2

For more information on module installation, please visit the detailed CPAN module installation guide.

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	Search terms
module: (e.g. module:Plugin)
distribution: (e.g. distribution:Dancer auth)
author: (e.g. author:SONGMU Redis)
version: (e.g. version:1.00)

NAME

SYNOPSIS

VERSION

DESCRIPTION

APACHE2 EXPRESSION

comp

cond

expr

function

integercomp

listfunc

regex

string

stringcomp

substring

variable

word

words

ADVANCED APACHE2 EXPRESSION

comp

cond

expr

function

integercomp

join

list

listfunc

regany

regex

regsub

split

string

stringcomp

sub

substring

variable

word

words

LEGACY

CAVEAT

CHANGES & CONTRIBUTIONS

AUTHOR

SEE ALSO

COPYRIGHT & LICENSE

Module Install Instructions