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04-04-2009
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Perl reg exp
Hi, I am using the following piece of code for extracting some data from in between some tags ... Code:
$text =~ /<TAG1>(.*)<\/TAG1>.*<TAG2>(.*)<\/TAG2>.*<TAG3>(.*)<\/TAG4>.*<TAG5>(.*)<\/TAG5>/; $tag1=$1; print "\n$tag1"; But I am getting an error like Use of uninitialized value in concatenation (.) or string. The script is running fine on Perl 5.8 but not on 5.6. Is this a version issue? If so then what is the workaround for it? |
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04-04-2009
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Well, if it works on one and not the other, it could be a version issue but I don't know for sure. The regexp is probably better written like so: Code:
$text =~ /<TAG1>(.*?)<\/TAG1>.*?<TAG2>(.*?)<\/TAG2>.*?<TAG3>(.*?)<\/TAG4>.*?<TAG5>(.*?)<\/TAG5>/; $tag1 = defined $1 ? $1 : 'no match found'; print "\n$tag1"; If you reall only want to capture $1 you should remove all the other parentheses from the regexp as they are aslo capturing pattern matches and storing them in memory for no reason. |
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