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Detecting a word from a string in Perl

Posted on 2004-04-29
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Detecting a word from a string in Perl

give variable $mysentence = "This house is red and not white";

Need a quick routine to check if a word is present in the variable and flag it if it is...

IE....if the word red is in the sentence then wordflag=1 else wordflag=0

Would also be nice if it could handle any case.

thanks
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Question by:webcs
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dorward earned 25 total points
ID: 10952153
if ($mysentence =~ /word/) { $wordflag = 1; } else { $wordflag = 0; }
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Expert Comment

by:Zyloch
ID: 10953737
To be even more careful, if you want to test the word case insensitive, do this: [code from dorward above]

if ($mysentence =~ /word/i) {$wordflag=1;} else {$wordflag=0;}

--Zyloch
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Assisted Solution

by:Tintin
Tintin earned 25 total points
ID: 10954375
Depends a little on your definition of a word.  Using 'red' as an example, if you don't want to match partial words like 'hatred', then use the \b to only match words based on word boundaries, eg:

my $word = 'red';
my $wordflag = 0;
$wordflag = 1 if ($mysentence =~ /\b$word\b/i);
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