Migrate more tests from blink repository.

test/webkit/fast/regex/malformed-escapes-expected.txt

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-Tests that regular expressions treat non-BMP characters as two separate characters. From a Unicode correctness point of view this is wrong, but it is what other browsers do. And given that we store strings as UTF-16, it is also more efficient to implement. Also test some other cases related to UTF-8 and UTF-16.
+This page tests handling of malformed escape sequences.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS /./.exec(surrogatePair).toString().length is 1
-PASS /\D/.exec(surrogatePair).toString().length is 1
-PASS /\S/.exec(surrogatePair).toString().length is 1
-PASS /\W/.exec(surrogatePair).toString().length is 1
-PASS /[^x]/.exec(surrogatePair).toString().length is 1
 
-PASS /.{1,2}/.exec("!!" + String.fromCharCode(0xA1)).toString().length is 2
-PASS /./.exec("") is null
+Testing regexp: /\ug/gm
+PASS regexp.test('ug') is true
+PASS regexp.lastIndex is 2
 
+Testing regexp: /\xg/gm
+PASS regexp.test('xg') is true
+PASS regexp.lastIndex is 2
+
+Testing regexp: /\c_/gm
+PASS regexp.test('\\c_') is true
+PASS regexp.lastIndex is 3
+
+Testing regexp: /[\B]/gm
+PASS regexp.test('B') is true
+PASS regexp.lastIndex is 1
+
+Testing regexp: /[\b]/gm
+PASS regexp.test('\b') is true
+PASS regexp.lastIndex is 1
+
+Testing regexp: /\8/gm
+PASS regexp.test('\\8') is true
+PASS regexp.lastIndex is 2
+
+Testing regexp: /^[\c]$/
+PASS regexp.test('c') is true
+
+Testing regexp: /^[\c_]$/
+PASS regexp.test('c') is false
+
+Testing regexp: /^[\c]]$/
+PASS regexp.test('c]') is true
 PASS successfullyParsed is true
 
 TEST COMPLETE