Added regex support as per issue #164.

jq now depends on oniguruma for regex support.
Modified configure.ac accordingly.

Added valgrind suppression file for oniguruma to prevent one-time and bounded
leaks from causing tests to fail.

Signed-off-by: Nicolas Williams <nico@cryptonector.com>

tests/all.test

@@ -649,6 +649,50 @@ def inc(x): x |= .+1; inc(.[].a)
 ["fo", "foo", "barfoo", "foobar", "barfoob"]
 [false, true, true, false, false]
 
+# match builtin
+[match("( )*"; "g")]
+"abc"
+[{"offset":0, "length":0, "string":"", "captures":[]},{"offset":1, "length":0, "string":"", "captures":[]},{"offset":2, "length":0, "string":"", "captures":[]}]
+
+[match("( )*"; "gn")]
+"abc"
+[]
+
+[match("a"; "gi")]
+"āáàä"
+[]
+
+[match(["(bar)"])]
+"foo bar"
+[{"offset": 4, "length": 3, "string": "bar", "captures":[{"offset": 4, "length": 3, "string": "bar", "name": null}]}]
+
+# offsets account for combining codepoints and multi-byte UTF-8
+[match("bar")]
+"ā bar with a combining codepoint U+0304"
+[{"offset": 3, "length": 3, "string": "bar", "captures":[]}]
+
+# matches with combining codepoints still count them in their length
+[match("bār")]
+"a bār"
+[{"offset": 2, "length": 4, "string": "bār", "captures":[]}]
+
+[match(".+?\\b")]
+"ā two-codepoint grapheme"
+[{"offset": 0, "length": 2, "string": "ā", "captures":[]}]
+
+[match(["foo (?<bar123>bar)? foo", "ig"])]
+"foo bar foo foo  foo"
+[{"offset": 0, "length": 11, "string": "foo bar foo", "captures":[{"offset": 4, "length": 3, "string": "bar", "name": "bar123"}]},{"offset":12, "length": 8, "string": "foo  foo", "captures":[{"offset": -1, "length": 0, "string": null, "name": "bar123"}]}]
+
+#test builtin
+[test("( )*"; "gn")]
+"abc"
+[false]
+
+[test("ā")]
+"ā"
+[true]
+
 [.[]|ltrimstr("foo")]
 ["fo", "foo", "barfoo", "foobar", "afoo"]
 ["fo","","barfoo","bar","afoo"]
@@ -857,4 +901,4 @@ flatten(2)
 
 flatten(2)
 [0, [1, [2]], [1, [[3], 2]]]
-[0, 1, 2, 1, [3], 2]
+[0, 1, 2, 1, [3], 2]