Perhaps the simplest solution is a two-part regex sequence: 
$_ = '---LL--C----LCSH-------CSHL-------LCSLH-------LCCHLSHCL----';
while (m/([A-Z]+)/g) {
    ($s = $1) =~ s/^L+|L+$//g;
    print "$s\n" if $s;
}

[download]
EDIT: Oops, missed that.

In reply to Re: Regexp: How to match in middle but not the ends? by TedPride
in thread Regexp: How to match in middle but not the ends? by cormanaz

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