$s1 =~ /\Q$s2/

Updated: oh, if you don't know which is shorter:

length($s1)>length($s2) ? $s1 =~ /\Q$s2/ : $s2 =~ /\Q$s1/;

In reply to Re: Check if one string is a substring of another. by ayrnieu
in thread Check if one string is a substring of another. by Anonymous Monk

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