Update.

test/regex/match_all.wren

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+// retoor <retoor@molodetz.nl>
+
+import "regex" for Regex, Match
+
+var re = Regex.new("\\d+")
+var matches = re.matchAll("abc123def")
+
+System.print(matches.count) // expect: 1
+System.print(matches[0].text) // expect: 123
+System.print(matches[0].start) // expect: 3
+System.print(matches[0].end) // expect: 6
+
+var re2 = Regex.new("notfound")
+var empty = re2.matchAll("some text")
+System.print(empty.count) // expect: 0
+
+var re3 = Regex.new("(\\w+)@(\\w+)")
+var emails = re3.matchAll("contact: user@domain here")
+System.print(emails.count) // expect: 1
+System.print(emails[0].text) // expect: user@domain
+System.print(emails[0][1]) // expect: user
+System.print(emails[0][2]) // expect: domain
+
+var re4 = Regex.new("a")
+var manyA = re4.matchAll("apple")
+System.print(manyA.count) // expect: 1
+System.print(manyA[0].start) // expect: 0
+
+var re5 = Regex.new("test")
+var single = re5.matchAll("this is a test string")
+System.print(single.count) // expect: 1
+System.print(single[0].text) // expect: test
+System.print(single[0].start) // expect: 10
+System.print(single[0].end) // expect: 14
+
+var re6 = Regex.new(" ")
+var spaces = re6.matchAll("a b")
+System.print(spaces.count) // expect: 1
+System.print(spaces[0].text == " ") // expect: true
+System.print(spaces[0].start) // expect: 1