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Err..., a substring between two adjacent characters is always "".

Probably, not the best title chosen for your problem.

As said, a regex solves your problem easily:

while (<DATA>){ if (/^.*?\_(.*?)(CI|I)SD\_.*?$/) {print $1,"\n"} } __DATA__ my_firstmachISD_blah_blah the_secondCISD_blah_blah_blah

Updated: I need to trim the last few characters which could be either CISD or ISD

Updated again: yes, C?ISD is better than (CI|I)SD

In reply to Re: How to get substring between first and second character by pvaldes
in thread How to get substring between first and second character by tale103108

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