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Task/String-matching/JavaScript/string-matching.js

@@ -0,0 +1,27 @@
+var stringA = "tacoloco"
+  , stringB = "co"
+  , q1, q2, q2multi, m
+  , q2matches = []
+
+// stringA starts with stringB
+q1 = stringA.substring(0, stringB.length) == stringB
+
+// stringA contains stringB
+q2  = stringA.indexOf(stringB)
+
+// multiple matches
+q2multi = new RegExp(stringB,'g')
+
+while(m = q2multi.exec(stringA)){
+	q2matches.push(m.index)
+}
+
+// stringA ends with stringB
+q3 = stringA.substr(-stringB.length) == stringB
+
+console.log("1: Does '"+stringA+"' start with '"+stringB+"'? " + ( q1 ? "Yes." : "No."))
+console.log("2: Is '"+stringB+"' contained in '"+stringA+"'? " + (~q2 ? "Yes, at index "+q2+"." : "No."))
+if (~q2 && q2matches.length > 1){
+	console.log("   In fact, it happens "+q2matches.length+" times within '"+stringA+"', at index"+(q2matches.length > 1 ? "es" : "")+" "+q2matches.join(', ')+".")
+}
+console.log("3: Does '"+stringA+"' end with '"+stringB+"'? "   + ( q3 ? "Yes." : "No."))