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I recommend Regexp::Assemble for something like this. An example:
use warnings; use strict; use Regexp::Assemble; my @keywords = qw( a an the then that this ); my $key_rea = Regexp::Assemble->new; $key_rea->add($_) for @keywords; my $key_re = $key_rea->re; my $data = do { undef $/; <DATA> }; print "$1\n" while $data =~ m/(\b$key_re\b)/g; __DATA__ hello everyone, i had been trying to make a lexical analyzer for c, wh +ere all the keywords were to be inputted in a text file keywords. thi +s i stored in an array. but this process is not being automated. the +code i wrote is as follows :- ... the keywords file contains:- auto continue enum if short break switch +volatile default extern int signed typedef while case do float long s +izeof union char double for register static unsigned const else goto +return struct void

In reply to Re: how to automate the regular expression match from a file? by eff_i_g
in thread how to automate the regular expression match from a file? by vikashiiitdm

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    [ovedpo15]: consider the following format of strings: some_data-doesn't- matter,value. how I get the value with regex? it should be after the last comma (last string)
    [Corion]: Text::CSV_XS for all your CSV file parsing needs. Other than that, what problems do you have with perlre, and capturing everything after the comma? Also, index and substr would also work.
    [choroba]: my ($value) = $string =~ /.*,(.*)/
    [choroba]: The .* at the beginning matches the longest possible substring, so it eats any previous commas
    [choroba]: But for CSV, use appropriate modules

    How do I use this? | Other CB clients
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