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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 ( #881019=note: print w/ replies, xml ) Need Help??


in reply to Re: Regex to match multiple words in an email subject
in thread Regex to match multiple words in an email subject

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


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Re^3: Regex to match multiple words in an email subject
by philipbailey (Chaplain) on Jan 07, 2011 at 09:58 UTC

    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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