Please suggest me which topics in perl would help me solve these problems.

Please see Perl documentation perlre (hard core), perlretut (thorough tutorial), perlrequick (quick tutorial), perlreref (quick reference). These are all also available at the command line via, e.g.,  perldoc perlre etc. See also the PerlMonks Tutorials Pattern Matching, Regular Expressions, and Parsing.

In reply to Re: How can I count characters between two same substrings in a string where the substring is repeated more than 5 times? by AnomalousMonk
in thread How can I count characters between two same substrings in a string where the substring is repeated more than 5 times? by supriyoch_2008

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