Two approaches, one simple, one less so... 

my $v = "lech_lecht";

#APPROACH ONE - single regex
$cnt = 0;
$v =~ m{
    .*? 
      (?{$cnt++})
    lecht
      (?{$cnt+=4})
}x;
print "$cnt\n";


#APPROACH TWO - feed regex output to length()
$v =~ /.*?lecht/;
print length $&, "\n";

__OUTPUT__
10
10

[download]

Note, that for position, you may want to subtract one from the result, as these approaches give 1-based answers.

,welchavw

In reply to Re: index() problem by welchavw
in thread index() problem by Anonymous Monk

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