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Answer: How do I put bracket on substring(s) of a string?

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Q&A > strings > How do I put bracket on substring(s) of a string? contributed by monkfan

This is an attempt to save a thread in SoPW which I thought can be useful for others.

There are already incredible answers in the thread, so feel free to check in SoPW. Please don't misunderstand me. I honestly think this can be useful. I don't mean to boost my XP here, or in that thread which I posted.

One possible answers is given by good sgifford

#!/usr/bin/perl -w use strict; my $s1 ='CCCATCTGTCCTTATTTGCTG'; my @a1 = qw(ATCTG ATTTG); my $s2 ='ACCCATCTGTCCTTGGCCAT'; my @a2 = qw(CCATC); my $s3 ='CCACCAGCACCTGTC'; my @a3 = qw(CCACC CCAGC GCACC); my $s4 ='CCCAACACCTGCTGCCT'; my @a4 = qw(CCAAC ACACC); put_bracket($s1,\@a1); put_bracket($s2,\@a2); put_bracket($s3,\@a3); put_bracket($s4,\@a4); sub put_bracket { my( $str, $ar ) = @_; foreach my $subs ( @$ar ) { # Construct a regexp with [\[\]] between all the letters my $newsub = join '[\[\]]?', split //, $subs; $str =~ s/($newsub)/[$1]/g; } # Now de-nest the brackets in the string my $depth = 0; my $newstr = ''; foreach my $c ( split //, $str ) { if ( $c eq '[' ) { $newstr .= $c if $depth++ == 0; } elsif ( $c eq ']' ) { $newstr .= $c if --$depth == 0; } else { $newstr .= $c; } } return $newstr; }
More can be found here. Don't vote my root posting but vote those remarkable answers you will find there.

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