You can do this using the pos function when performing matching against a string - This function returns the offset of where the last "m//g" search left off for the variable in question ($_ is used when the variable is not specified).
The following code demonstrates this function in action:
#!/opt/bin/perl
$str = 'The quick brown fox jumps over the lazy dog.';
while ( $str =~ /[aeiou]/ig ) {
printf(
"%d %s\n",
pos( $str ),
substr( $str, pos( $str ) - 1 )
);
substr( $str, 0, pos( $str ), '' );
}
perl -le "print unpack'N', pack'B32', '00000000000000000000001011100101'"
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are good places to start.
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