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# To find all occurance of "bc" preceeded by 3 letters, and followed b
+y 2 letters.
$str = "aaabcabcdebcaabebcb";
...
__OUTPUT__
0,7,aaabcab
7,14,cdebcaa

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__OUTPUT__
0,6,aaabcab
3,9,bcabcde
7,13,cdebcaa