LibRegex: Implement ECMA262 multiline matching without splitting lines

As ECMA262 regex allows `[^]` and literal newlines to match newlines in
the input string, we shouldn't split the input string into lines, rather
simply make boundaries and catchall patterns capable of checking for
these conditions specifically.

1 files changed, 1 insertions, 1 deletions

diff --git a/Userland/Libraries/LibC/regex.h b/Userland/Libraries/LibC/regex.h
index 3697286de6..a01ea1d3c4 100644
--- a/Userland/Libraries/LibC/regex.h
+++ b/Userland/Libraries/LibC/regex.h
@@ -83,6 +83,7 @@ enum __RegexAllFlags {
     __Regex_SkipTrimEmptyMatches = __Regex_Global << 13,     // Do not remove empty capture group results.
     __Regex_Internal_Stateful = __Regex_Global << 14,        // Internal flag; enables stateful matches.
     __Regex_Internal_BrowserExtended = __Regex_Global << 15, // Internal flag; enable browser-specific ECMA262 extensions.
+    __Regex_Internal_ConsiderNewline = __Regex_Global << 16, // Internal flag; allow matchers to consider newlines as line separators.
     __Regex_Last = __Regex_SkipTrimEmptyMatches
 };
 
@@ -97,7 +98,6 @@ enum __RegexAllFlags {
 #define REG_NOTBOL __Regex_MatchNotBeginOfLine // The circumflex character (^), when taken as a special character, will not match the beginning of string.
 #define REG_NOTEOL __Regex_MatchNotEndOfLine   // The dollar sign ($), when taken as a special character, will not match the end of string.
 
-//static_assert (sizeof(FlagsUnderlyingType) * 8 >= regex::POSIXFlags::Last << 1), "flags type too small")
 #define REG_SEARCH __Regex_Last << 1
 
 int regcomp(regex_t*, const char*, int);