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Re: Extracting the number of %'s in a string

by Zaxo (Archbishop)
on Dec 13, 2007 at 09:46 UTC ( [id://656782]=note: print w/replies, xml ) Need Help??


in reply to Extracting the number of %'s in a string

To count them, 

$_=q(aaa%bbbbb%cccccc%ddd);
print tr/%//, $/;

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prints '3'

To extract their positions; 

$_ = 'aaa%bbbbb%cccccc%ddd';
print $-[0], ' ' while /%/g;
print $/'

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prints "3 9 16".

See perlvar for the @- array magic. You would push those values to an array, instead of printing, for further use.

After Compline,
Zaxo

Replies are listed 'Best First'.
Re^2: Extracting the number of %'s in a string
by moritz (Cardinal) on Dec 13, 2007 at 10:08 UTC
    The counting solution will give a wrong result if the string has a trailing %, because the OP wants the number of %s followed by another character.
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