[regexp] allow loose matching for property names.

As described in unicode database file PropertyValueAliases.txt

R=littledan@chromium.org
BUG=v8:4743
LOG=N

Review URL: https://codereview.chromium.org/1776953002

Cr-Commit-Position: refs/heads/master@{#34638}

src/char-predicates-inl.h

@@ -43,10 +43,6 @@ inline bool IsAlphaNumeric(uc32 c) {
   return IsInRange(AsciiAlphaToLower(c), 'a', 'z') || IsDecimalDigit(c);
 }
 
-inline bool IsAlpha(uc32 c) {
-  return IsInRange(AsciiAlphaToLower(c), 'a', 'z');
-}
-
 inline bool IsDecimalDigit(uc32 c) {
   // ECMA-262, 3rd, 7.8.3 (p 16)
   return IsInRange(c, '0', '9');

src/char-predicates.h

@@ -18,7 +18,6 @@ inline bool IsCarriageReturn(uc32 c);
 inline bool IsLineFeed(uc32 c);
 inline bool IsAsciiIdentifier(uc32 c);
 inline bool IsAlphaNumeric(uc32 c);
-inline bool IsAlpha(uc32 c);
 inline bool IsDecimalDigit(uc32 c);
 inline bool IsHexDigit(uc32 c);
 inline bool IsOctalDigit(uc32 c);

src/regexp/regexp-parser.cc

@@ -840,11 +840,11 @@ ZoneList<CharacterRange>* RegExpParser::ParsePropertyClass() {
 #ifdef V8_I18N_SUPPORT
   ZoneList<char> property_name(0, zone());
   if (current() == '{') {
-    for (Advance(); IsAlpha(current()); Advance()) {
+    for (Advance(); current() != '}'; Advance()) {
+      if (!has_next()) return nullptr;
       property_name.Add(static_cast<char>(current()), zone());
     }
-    if (current() != '}') return nullptr;
-  } else if (IsAlpha(current())) {
+  } else if (current() != kEndMarker) {
     property_name.Add(static_cast<char>(current()), zone());
   } else {
     return nullptr;

test/mjsunit/harmony/regexp-property-general-category.js

@@ -62,3 +62,9 @@ assertTrue(/\pL/u.test("\u1FAB"));
 assertFalse(/\PL/u.test("\u1FAB"));
 assertFalse(/\p{L}/u.test("\uA6EE"));
 assertTrue(/\P{L}/u.test("\uA6EE"));
+
+assertTrue(/\p{Lowercase_Letter}/u.test("a"));
+assertTrue(/\p{LowercaseLetter}/u.test("a"));
+assertTrue(/\p{Lowercaseletter}/u.test("a"));
+assertTrue(/\p{lowercase letter}/u.test("a"));
+assertTrue(/\p{lowercase    letter}/u.test("a"));