regex related...search and delete

freekngeek has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: regex related...search and delete by choroba (Cardinal) on Jan 14, 2013 at 10:32 UTC
You can use a simple substitution. `[LW]` is a character class containing both L and W, the final `/g` is needed to replace both the letters. `$string = "(L 2 W 7)"; $string =~ s/[LW] //g; # Replace L or W followed by a space by nothing +. print $string, "\n";` [download] لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]
Re^2: regex related...search and delete by freekngeek (Acolyte) on Jan 14, 2013 at 10:41 UTC
Thanks a lot man. it's working :)	[reply]
Re: regex related...search and delete by The Perlman (Scribe) on Jan 14, 2013 at 10:33 UTC
bla ... depending on your textfile this can be indefinitely complex. are parens ever nested? is it always `(L \d+ W \d+)`? If it's not a fix format I would try to match every parens-pair, and call a function with the match with /e modifier. `s/$.*?$/kill_LW($&)/ge` - Ron	[reply] [d/l] [select]
Re^2: regex related...search and delete by freekngeek (Acolyte) on Jan 14, 2013 at 10:43 UTC
It's a fix format and it's working now. Thank you for your solution, May be I'll try this some other time.	[reply]
Re^3: regex related...search and delete by LanX (Saint) on Jan 14, 2013 at 10:53 UTC
> It's a fix format and it's working now. no it's not, chorobas solution will delete any "L " outside of parens too. if its really a fix format, use something like `s/$L (\d+) W (\d+)$/($1 $2)/g` Cheers Rolf	[reply] [d/l]
Re: regex related...search and delete by Anonymous Monk on Jan 14, 2013 at 10:45 UTC
but I want to have only values inside the brackets. I couldnt find any answer by myself. Where did you look? Have you read perlintro#Regular expressions, Parentheses for capturing Did you check perlfaq6: Regular Expressions? perlrequick ? perlretut? What did you try, did you try quotemeta? Did you escape "(" like "\(" ?	[reply]
Re: regex related...search and delete (m/\G..//gcx) by Anonymous Monk on Jan 14, 2013 at 11:24 UTC
See Re: print output from the text file. (marpa scanless dsl calculator), Re^2: Help with regular expression ( m/\G/gc ), perlfaq6#What good is \G in a regular expression?	[reply]