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Old 08-26-2005, 07:56 PM   #1
Registered: May 2005
Distribution: Slack, FreeBSD,NetBSD, OpenBSD, Open Solaris, Minix
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Perl Pattern Matching Question

I'm fairly new to perl and I'm having a slight pattern matching issue.

The problem piece of code looks something like this:

until ($variable =~ /word/i) {
do things}

My problem is that as long as "word" is present the until function ignores whatever comes before word. I'd like to fix this.

I had the same problem with characters which came after "word", and I fixed that by doing something like this:

until (($variable =~ /word/i) and ($variable !~ /word./) and ($variable !~ /word./)){
do things}

This works fine for characters after "word", but I can't seem to get the check to work for characters that appear before "word".

Any help is appreciated.
Old 08-27-2005, 12:53 AM   #2
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what exactly are you trying to match?

if you want to match strings that say "word" exactly, then you can use /^word$/ (this use is unnecessary as "lc($variable) eq 'word' " will do). ^ asserts the beginning of the line, and $ asserts the end.

if you want to match strings where "word" is surrounded by whitespace or boundary of string, you can use /\bword\b/ (\b asserts word boundary)

you can also construct more complicated assertions
Old 08-27-2005, 10:26 AM   #3
Registered: May 2005
Distribution: Slack, FreeBSD,NetBSD, OpenBSD, Open Solaris, Minix
Posts: 172

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Thank you very much for your help. /^word$/ was sufficient. I was trying to match different things, as I was having the problem with all my programs. Most irritating were a few programs I wrote for my girlfriend. One of which would check for our names, and she kept inserting obnoxiously things before my name and laughing. It had to be stopped. Thanks again.


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