Normative: Always check regular expression flags by "flags" (tc39#2791)

spec.html

@@ -36555,12 +36555,11 @@ <h1>RegExp.prototype [ @@match ] ( _string_ )</h1>
           1. Let _rx_ be the *this* value.
           1. If Type(_rx_) is not Object, throw a *TypeError* exception.
           1. Let _S_ be ? ToString(_string_).
-          1. Let _global_ be ToBoolean(? Get(_rx_, *"global"*)).
-          1. If _global_ is *false*, then
+          1. Let _flags_ be ? ToString(? Get(_rx_, *"flags"*)).
+          1. If _flags_ does not contain *"g"*, then
             1. Return ? RegExpExec(_rx_, _S_).
           1. Else,
-            1. Assert: _global_ is *true*.
-            1. Let _fullUnicode_ be ToBoolean(? Get(_rx_, *"unicode"*)).
+            1. If _flags_ contains *"u"*, let _fullUnicode_ be *true*. Otherwise, let _fullUnicode_ be *false*.
             1. Perform ? Set(_rx_, *"lastIndex"*, *+0*<sub>𝔽</sub>, *true*).
             1. Let _A_ be ! ArrayCreate(0).
             1. Let _n_ be 0.
@@ -36626,9 +36625,10 @@ <h1>RegExp.prototype [ @@replace ] ( _string_, _replaceValue_ )</h1>
           1. Let _functionalReplace_ be IsCallable(_replaceValue_).
           1. If _functionalReplace_ is *false*, then
             1. Set _replaceValue_ to ? ToString(_replaceValue_).
-          1. Let _global_ be ToBoolean(? Get(_rx_, *"global"*)).
+          1. Let _flags_ be ? ToString(? Get(_rx_, *"flags"*)).
+          1. If _flags_ contains *"g"*, let _global_ be *true*. Otherwise, let _global_ be *false*.
           1. If _global_ is *true*, then
-            1. Let _fullUnicode_ be ToBoolean(? Get(_rx_, *"unicode"*)).
+            1. If _flags_ contains *"u"*, let _fullUnicode_ be *true*. Otherwise, let _fullUnicode_ be *false*.
             1. Perform ? Set(_rx_, *"lastIndex"*, *+0*<sub>𝔽</sub>, *true*).
           1. Let _results_ be a new empty List.
           1. Let _done_ be *false*.