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Re: Regex to match multiple words in an email subject

by philipbailey (Chaplain)
on Jan 07, 2011 at 05:33 UTC ( #881013=note: print w/ replies, xml ) Need Help??


in reply to Regex to match multiple words in an email subject

#!/usr/bin/perl use warnings; use strict; for (<DATA>) { print /(?:SSL|SSL Certificate|VASCO)/ ? "Match\n" : "No match\n"; } __DATA__ SSL SSL Certificate VASCO something else

Output:

Match
Match
Match
No match


Comment on Re: Regex to match multiple words in an email subject
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Re^2: Regex to match multiple words in an email subject
by jwkrahn (Monsignor) on Jan 07, 2011 at 07:22 UTC
    print /(?:SSL|SSL Certificate|VASCO)/ ? "Match\n" : "No match\n";

    Because the pattern is not anchored at either end the string 'SSL Certificate' will never match.

    $ perl -le' my @strings = ( "SSL", "SSL Certificate", "VASCO", "something else", ); for ( @strings ) { print $1 if /(SSL|SSL Certificate|VASCO)/; } ' SSL SSL VASCO

    With no anchors you need to put the longer strings first:

    $ perl -le' my @strings = ( "SSL", "SSL Certificate", "VASCO", "something else", ); for ( @strings ) { print $1 if /(SSL Certificate|SSL|VASCO)/; } ' SSL SSL Certificate VASCO

      That's a good point, but in the OP's use case it's irrelevant. In fact, the regex could be trimmed down to:

      /(SSL|VASCO)/

      Or, to avoid unnecessary capturing:

      /(?:SSL|VASCO)/

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