NAME

recs-fromre

recs-fromre --help-all

Help from: --help-basic:
Usage: recs-fromre <args> <re> [<files>]
   <re> is matched against each line of input (or lines of <files>). Each successfully match results in one output record whose field values are the capture groups from the match. Lines that do not match are ignored. Keys are named
   numerically (0, 1, etc.) or as given by --key.

   For spliting on a delimeter, see recs-fromsplit.

Arguments:
   --key|-k <key>               Comma separated list of key names. May be specified multiple times. may be a key spec, see 'man recs' for more
   --filename-key|fk <keyspec>  Add a key with the source filename (if no filename is applicable will put NONE)

  Help Options:
      --help-all       Output all help for this script
      --help           This help screen
      --help-keyspecs  Help on keyspecs, a way to index deeply and with regexes

Examples:
   Parse greetings
      recs-fromre --key name,age '^Hello, my name is (.*) and I am (\d*) years? old$'
   Parse a single key named time from a group of digits at the beginning of the line
      recs-fromre --key time '^(\d+)'
   Map three sets of <>s to a record with keys named 0, 1, and 2
      recs-fromre '<(.*)>\s*<(.*)>\s*<(.*)>'

Help from: --help-keyspecs:
KEY SPECS   
   A key spec is short way of specifying a field with prefixes or regular expressions, it may also be nested into hashes and arrays. Use a '/' to nest into a hash and a '#NUM' to index into an array (i.e. #2)

   An example is in order, take a record like this:
   
     {"biz":["a","b","c"],"foo":{"bar 1":1},"zap":"blah1"}
     {"biz":["a","b","c"],"foo":{"bar 1":2},"zap":"blah2"}
     {"biz":["a","b","c"],"foo":{"bar 1":3},"zap":"blah3"}
   
   In this case a key spec of 'foo/bar 1' would have the values 1,2, and 3 in the respective records.

   Similarly, 'biz/#0' would have the value of 'a' for all 3 records

   You can also prefix key specs with '@' to engage the fuzzy matching logic
   
   Fuzzy matching works like this in order, first key to match wins
     1. Exact match ( eq )
     2. Prefix match ( m/^/ )
     3. Match anywehre in the key (m//)
   
   So, in the above example '@b/#2', the 'b' portion would expand to 'biz' and 2 would be the index into the array, so all records would have the value of 'c'

   Simiarly, @f/b would have values 1, 2, and 3

   You can escape / with a \. For example, if you have a record:
   {"foo/bar":2}

   You can address that key with foo\/bar

See Also

RecordStream(3) - Overview of the scripts and the system

recs-examples(3) - A set of simple recs examples

recs-story(3) - A humorous introduction to RecordStream

SCRIPT --help - every script has a --help option, like the output above