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Re: Regex + substring

by AnomalousMonk (Chancellor)
on Mar 27, 2012 at 14:36 UTC ( #961941=note: print w/replies, xml ) Need Help??

in reply to Regex + substring

... sometimes there can be "-" character within the string ...

Along with JavaFan, I have no idea what's supposed to happen when a '-' character is encountered, so I'll just tiptoe quietly around that one.

Your apparent first thought about using split doesn't seem so bad:

>perl -wMstrict -le "my $orig = 'AABBCCDDEEFFGGHH'; my $mod = 'bCCDdEEFfgGH'; ;; my @chunks = split /$mod/i, $orig; my $new = qq{\L$chunks[0]\E$mod\L$chunks[1]\E}; print qq{'$new'}; " 'aabbCCDdEEFfgGHh'

Update 1: If there might be  * + ? [ ] etc. metacharacter-like things in the  $mod string, best to split on  /\Q$mod\E/i instead.

Update 2: A more general approach (updated again to be a lot simpler):

>perl -wMstrict -le "my $orig = 'fEEfoobarFIEFooBarFoEfOoBaRfUM'; my $mod = 'FooBar'; ;; my @chunks = split /\Q$mod\E/i, $orig, -1; my $new = join $mod, map lc(), @chunks; print qq{'$new'}; " 'feeFooBarfieFooBarfoeFooBarfum'

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Re^2: Regex + substring
by Anonymous Monk on Mar 27, 2012 at 16:10 UTC

    Sorry I just coppied the the code without looking at the text. When "-" is encounter the output would have to be the same with just the - included i.e.

    $O = "AAABBBCCCDDD"; $Mod = "BbBCc-C"; $Result = "aaaBbBCc-Cddd";


      >perl -wMstrict -le "my $orig = 'fEEfoobarFIEFOOBARFoEfOoBaRfUM'; my $mod = 'Foo-Bar'; ;; (my $modmod = $mod) =~ tr/-//d; my $new = join $mod, map lc(), split /\Q$modmod\E/i, $orig, -1; print qq{'$new'}; " 'feeFoo-BarfieFoo-BarfoeFoo-Barfum'

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