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Task/String-matching/Maple/string-matching.maple

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+> with( StringTools ): # bind package exports at the top-level
+> s := "dzrIemaWWIMidXYZwGiqkOOn":
+> s[1..4]; # pick a prefix
+                                 "dzrI"
+
+> IsPrefix( s[ 1 .. 4 ], s ); # check it
+                                  true
+
+> s[ -4 .. -1 ]; # pick a suffix
+                                 "kOOn"
+
+> IsSuffix( s[ -4 .. -1 ], s ); # check it
+                                  true
+
+> p := Search( "XYZ", s ); # find a substring
+                                p := 14
+
+> s[ p .. p + 2 ]; # check
+                                 "XYZ"
+
+> SearchAll( [ "WWI", "XYZ" ], s ); # search for multiple patterns
+                            [8, 1], [14, 2]
+
+> to 3 do s := cat( s, s ) end: length( s ); # build a longer string by repeated doubling
+                                  192
+
+> p := SearchAll( "XYZ", s ); # find all occurrences
+                p := 14, 38, 62, 86, 110, 134, 158, 182
+
+> {seq}( s[ i .. i + 2 ], i = p ); # check them
+                                {"XYZ"}