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From your output it looks as if you want to replace the first occurrence of multiple zeros with a single zero, any subsequent multiple zero group should be left alone. This seems to work

#!/usr/local/bin/perl # use strict; use warnings; print map { s{0{2,}}{0}; $_ } <DATA>; __END__ 215000007801 300000324002 890000457651 210004563401 201045139158

and the output is

21507801 30324002 890457651 2104563401 201045139158

I hope this is of use.



Update: Looks like I've misunderstood. If you say the first zero should not be touched, why does 890000457651 become 89457651 and not 890457651? Perhaps you could clarify what you require.

In reply to Re: Stuck in komplexer regex, at least for me by johngg
in thread Stuck in komplexer regex, at least for me by ultibuzz

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