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Task/String-matching/BASIC/string-matching-2.basic

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+10 A$ = "THIS, THAT, AND THE OTHER THING"
+20 S$ = "TH"
+30 DEF FN S(P) = MID$(A$, P, LEN(S$)) = S$
+40 PRINT A$ : PRINT
+
+110 S$(1) = "STARTS"
+120 S$(0) = "DOES NOT START"
+130 PRINT S$(FN S(1))" WITH "S$ : PRINT
+
+210 R$ = "" : FOR I = 1 TO LEN(A$) - LEN(S$) : IF FN S(I) THEN R$ = R$ + STR$(I) + " "
+220 NEXT I
+230 IF LEN(R$) = 0 THEN PRINT "DOES NOT CONTAIN "S$
+240 IF LEN(R$) THEN PRINT "CONTAINS "S$" LOCATED AT POSITION "R$
+250 PRINT
+
+310 E$(1) = "ENDS"
+320 E$(0) =  "DOES NOT END"
+330 PRINT E$(FN S(LEN(A$) - LEN(S$) + 1))" WITH "S$