Data update

Task/String-matching/Jq/string-matching-1.jq

@@ -1,3 +1,23 @@
 # startswith/1 is boolean:
 "abc" | startswith("ab")
 #=> true
+
+# index/1 returns the index or null,
+# so the jq test "if index(_) then ...." can be used
+# without any type conversion.
+
+"abcd" | index( "bc")
+#=> 1
+
+# endswith/1 is also boolean:
+
+"abc" | endswith("bc")
+#=> true
+
+# Using the regex functions available in jq 1.5:
+
+"abc" | test( "^ab")
+
+"abcd" | test("bc")
+
+"abcd" | test("cd$")