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parrent matching

Posted on 2001-08-20
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Last Modified: 2006-11-17
I want to substitude the string

"string/another string/more string/WORLD/more string" to
"http://www.com/WORLD"

the only I know is that WORLD is placed
between 3-rd and 4-th slashes "/"

Thanks
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Question by:kako
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5 Comments
 
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Expert Comment

by:interiot
ID: 6407121
I don't quite understand your question, but here's a guess.

    $str1 = "string/another string/more string/WORLD/more string";
    $str2 = "http://www.com/" . (split '/', $str1)[3];

    print "$str2\n";
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Author Comment

by:kako
ID: 6407148
Yes, It will work, But I want to do the same
with the substitution command s///;
using pattern matching, I think there should be the
way to do so.
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Expert Comment

by:interiot
ID: 6407223
Ahh.  Well, pure s///s would be slow, because it uses backreferences, but anyway:

    $str1 =~ s|(?:[^/]*/){3}([^/]*).*|http://www.com/$1|;

And this is faster, and more readable:

    $str1 =~ s|([^/]*/){3}||;
    $str1 =~ s|/.*||;
    $str1 = "http://www.com/$str1";
0
 

Author Comment

by:kako
ID: 6407226
Yes, It will work, But I want to do the same
with the substitution command s///;
using pattern matching, I think there should be the
way to do so.
0
 
LVL 3

Accepted Solution

by:
interiot earned 50 total points
ID: 6407321
s||| is the same as s///, so is the aforementioned line an acceptable solution?

    $str1 =~ s|(?:[^/]*/){3}([^/]*).*|http://www.com/$1|;
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