Initial data commit

Task/String-matching/Picat/string-matching.picat

@@ -0,0 +1,54 @@
+import util.
+
+go =>
+  S1 = "string second",
+  S2 = "string",
+
+  %  - Determining if the first string starts with second string
+  println("Using find/4"),
+  if find(S1,S2,1,_) then
+    println("S1 starts with S2")
+  else
+    println("S1 does not start with S2")
+  end,
+
+  println("Using append/3"),
+  if append(S2,_,S1) then
+    println("S1 starts with S2")
+  else
+    println("S1 does not start with S2")
+  end,
+
+  % - Determining if the first string contains the second string at any location
+  S3 = "this is a string",
+  S4 = "is a",
+  if find(S3,S4,Start4,End4) then
+    printf("S3 contains S4 at pos %d..%d\n", Start4,End4)
+  else
+    println("S3 does not contain S4")
+  end,
+
+  % - Determining if the first string ends with the second string
+  S5 = "this is a string",
+  S6 = "string",
+  if find(S5,S6,Start6,S5.length) then
+    printf("S5 ends with S6, startpos: %d\n",Start6)
+  else
+    println("S5 does not end with S6")
+  end,
+
+  if append(_,S6,S5) then
+    println("S5 ends with S6")
+  else
+    println("S5 does not end with S6")
+  end,
+
+  S7 = "this is a string or a string",
+  S8 = "a string",
+  All = findall([Start8,End8], find(S7,S8,Start8,End8)),
+  println(positions=All),
+
+  % searching for " "
+  All2 = findall([Start9,End9], find(S7," ",Start9,End9)),
+  println(positions=All2),
+  nl.