RE: How to avoid this greedy match?

Try out the following regular expression:

perl -e '$str = "...<script>442226</script>zzz<script>222</script>...";print "1=$1\n" if ($str =~ /.+<script>(.*222.*)<\/script>/);'

The regeular expression is: .+<script>(.*222.*)<\/script>

This might give a strange results if you have multiple '222' in the input string. Regex will always pick up the last occurance of '222'.

~Ajay

-----Original Message-----
From: News Howardz [mailto:news_howardz@xxxxxxxxx]
Sent: Tuesday, January 29, 2008 9:36 AM
To: beginners@xxxxxxxx
Subject: Re: How to avoid this greedy match?


The original mail is regarded as a SPAM by Yahoo -- poor regex match :-(.
So I modify the following content and resend it.
================================
Sorry, I make a mistake in the mail below:

$str = "...<script>xxx</script>zzz<script>y222yy</script>...";

I want to match the script section containing "222".
So I wrote regex like this:

/(<script>.*?222.*?<\/script>)/

But it doesn't work.
It still selects the 2 script sections: "<script>xxx</script>zzz<script>y222yy</script>".

Does anyone have an idea how to achieve this?

Thanks
Howardz

----- Original Message ----
From: News Howardz <news_howardz@xxxxxxxxx>
To: beginners@xxxxxxxx
Sent: Tuesday, January 29, 2008 11:22:41 AM
Subject: How to avoid this greedy match?

Hi,

I have a trouble when composing a regex.

$str = "...<scirpt>xxx</script>zzz<script>yyy</script>..."

In the above string, "xxx" and "yyy", "zzz" stand for any substring other than "<script>"

I want to pick up "<script>yyy</script>", but each time I get the 2 script sections matched "<scirpt>xxx</script>zzz<script>yyy</script>".

I've tried the following regex:
1) "<script>.*</script>
2) "<script>.*?</script>

How can I avoid the this greedy match?
(I'm using ActivePerl 5.6.1)

Thanks,
Howardz


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