From: Clay Tzoucalis <lists@...>
Date: 2012-04-26T04:48:31+09:00
Subject: matching substrings

I need a little help with an assignment. Following is the code I am
being asked to create, any help with this would be great.

Ask the user to enter two strings, a and b. Then return the number of
positions where they contain the same length 2 substring. So “xxcaazz”
and “xxbaaz” yields 3, since the “xx”, “aa”, and “az” substrings appear
in the same place in both strings.

string_match('xxcaazz', 'xxbaaz') → 3
string_match('abc', 'abc') → 2
string_match('abc', 'axc') → 0

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