Remove Global RegEx flag, default to unanchored patterns

core/text/regex/common/common.odin

@@ -15,8 +15,6 @@ MAX_PROGRAM_SIZE   :: int(max(i16))
 MAX_CLASSES        :: int(max(u8))
 
 Flag :: enum u8 {
-	// Global: try to match the pattern anywhere in the string.
-	Global,
 	// Multiline: treat `^` and `$` as if they also match newlines.
 	Multiline,
 	// Case Insensitive: treat `a-z` as if it was also `A-Z`.
@@ -36,7 +34,6 @@ Flags :: bit_set[Flag; u8]
 
 @(rodata)
 Flag_To_Letter := #sparse[Flag]u8 {
-	.Global            = 'g',
 	.Multiline         = 'm',
 	.Case_Insensitive  = 'i',
 	.Ignore_Whitespace = 'x',

core/text/regex/compiler/compiler.odin

@@ -401,7 +401,7 @@ compile :: proc(tree: Node, flags: common.Flags) -> (code: Program, class_data:
 
 	pc_open := 0
 
-	add_global: if .Global in flags {
+	optimize_opening: {
 		// Check if the opening to the pattern is predictable.
 		// If so, use one of the optimized Wait opcodes.
 		iter := virtual_machine.Opcode_Iterator{ code[:], 0 }
@@ -412,7 +412,7 @@ compile :: proc(tree: Node, flags: common.Flags) -> (code: Program, class_data:
 				pc_open += size_of(Opcode)
 				inject_at(&code, pc_open, Opcode(code[pc + size_of(Opcode) + pc_open]))
 				pc_open += size_of(u8)
-				break add_global
+				break optimize_opening
 
 			case .Rune:
 				operand := intrinsics.unaligned_load(cast(^rune)&code[pc+1])
@@ -420,24 +420,28 @@ compile :: proc(tree: Node, flags: common.Flags) -> (code: Program, class_data:
 				pc_open += size_of(Opcode)
 				inject_raw(&code, pc_open, operand)
 				pc_open += size_of(rune)
-				break add_global
+				break optimize_opening
 
 			case .Rune_Class:
 				inject_at(&code, pc_open, Opcode.Wait_For_Rune_Class)
 				pc_open += size_of(Opcode)
 				inject_at(&code, pc_open, Opcode(code[pc + size_of(Opcode) + pc_open]))
 				pc_open += size_of(u8)
-				break add_global
+				break optimize_opening
 
 			case .Rune_Class_Negated:
 				inject_at(&code, pc_open, Opcode.Wait_For_Rune_Class_Negated)
 				pc_open += size_of(Opcode)
 				inject_at(&code, pc_open, Opcode(code[pc + size_of(Opcode) + pc_open]))
 				pc_open += size_of(u8)
-				break add_global
+				break optimize_opening
 
 			case .Save:
 				continue
+
+			case .Assert_Start:
+				break optimize_opening
+
 			case:
 				break seek_loop
 			}

core/text/regex/regex.odin

@@ -167,7 +167,6 @@ to escape the delimiter if found in the middle of the string.
 
 All runes after the closing delimiter will be parsed as flags:
 
-- 'g': Global
 - 'm': Multiline
 - 'i': Case_Insensitive
 - 'x': Ignore_Whitespace
@@ -244,7 +243,6 @@ create_by_user :: proc(
 	// to `end` here.
 	for r in pattern[start + end:] {
 		switch r {
-		case 'g': flags += { .Global }
 		case 'm': flags += { .Multiline }
 		case 'i': flags += { .Case_Insensitive }
 		case 'x': flags += { .Ignore_Whitespace }
@@ -283,8 +281,6 @@ create_iterator :: proc(
 	permanent_allocator := context.allocator,
 	temporary_allocator := context.temp_allocator,
 ) -> (result: Match_Iterator, err: Error) {
-	flags := flags
-	flags += {.Global} // We're iterating over a string, so the next match could start anywhere
 
 	if .Multiline in flags {
 		return {}, .Unsupported_Flag