That is equivalent to $found = 'thispart' if 1+index( $str, 'thispart' );, but index is 3 times faster:

s='the quick brown fox jumps over the lazy dog'; 
cmpthese -1,{
    a => q[ if( $s =~ m[(lazy)] ){ $found=$1 } ],
    b => q[ $found = 'lazy' if 1+index( $s, 'lazy' ); ],
};;
       Rate    a    b
a  585631/s   -- -77%
b 2535746/s 333%   --

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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In reply to Re^2: Get a known substring from a string by BrowserUk
in thread Get a known substring from a string by jake7176

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