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  #1  
Old March 21st, 2013, 02:34 PM
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Index and whitespace

I think I know the answer already but is there a way to use 'index' to find the first occurrence of white space? TIA.
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Old March 21st, 2013, 07:26 PM
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ishnid agrees!

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Old March 22nd, 2013, 06:56 AM
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Thanks. I kind of figured the answer was no.

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Old March 22nd, 2013, 08:01 AM
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Index only works for specific substrings, so if you were looking for a particular whitespace character, it would work. If you're searching for any whitespace, a regexp will be the way to go.

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Old March 22nd, 2013, 05:27 PM
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Thanks, except I don't know of a way to use regex with index.

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Old March 22nd, 2013, 05:54 PM
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You can't.

Use either index (if you just need to find the specific space character (ASCII 32), i.e. the white space as typed by the space bar on a computer), and use a regex if you need to match the more general idea of white space (the \s metacharacter), i.e. either such a space or a tab, etc.

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Old March 22nd, 2013, 06:19 PM
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The problem is I need to know at what character position the first white space of any kind occurs. I'm thinking I need write a function to 'split' using a regexp for white space then return the length of the first string.

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Old March 25th, 2013, 05:43 AM
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From the links that spacebar208 posted, you will see that the $-[0] variable will hold the offset of the beginning of the last successful regexp match. So you can achieve what you want with:
Code:
if ( $str =~ /\s/ ) {
   print $-[0];
}

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