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Disregard lastIndex for non-global non-sticky regexps #627

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Dec 21, 2016
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Disregard lastIndex for non-global non-sticky regexps #627

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12 changes: 8 additions & 4 deletions spec.html
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Original file line number Diff line number Diff line change
Expand Up @@ -28687,17 +28687,18 @@ <h1>Runtime Semantics: RegExpBuiltinExec ( _R_, _S_ )</h1>
1. Assert: _R_ is an initialized RegExp instance.
1. Assert: Type(_S_) is String.
1. Let _length_ be the number of code units in _S_.
1. Let _lastIndex_ be ? ToLength(? Get(_R_, `"lastIndex"`)).
1. Let _flags_ be _R_.[[OriginalFlags]].
1. If _flags_ contains `"g"`, let _global_ be *true*, else let _global_ be *false*.
1. If _flags_ contains `"y"`, let _sticky_ be *true*, else let _sticky_ be *false*.
1. If _global_ is *false* and _sticky_ is *false*, let _lastIndex_ be 0.
1. Else, let _lastIndex_ be ? ToLength(? Get(_R_, `"lastIndex"`)).
1. Let _matcher_ be _R_.[[RegExpMatcher]].
1. If _flags_ contains `"u"`, let _fullUnicode_ be *true*, else let _fullUnicode_ be *false*.
1. Let _matchSucceeded_ be *false*.
1. Repeat, while _matchSucceeded_ is *false*
1. If _lastIndex_ &gt; _length_, then
1. Perform ? Set(_R_, `"lastIndex"`, 0, *true*).
1. If _global_ is *true* or _sticky_ is *true*, then
1. Perform ? Set(_R_, `"lastIndex"`, 0, *true*).
1. Return *null*.
1. Let _r_ be _matcher_(_S_, _lastIndex_).
1. If _r_ is ~failure~, then
Expand Down Expand Up @@ -28937,9 +28938,12 @@ <h1>RegExp.prototype [ @@search ] ( _string_ )</h1>
1. If Type(_rx_) is not Object, throw a *TypeError* exception.
1. Let _S_ be ? ToString(_string_).
1. Let _previousLastIndex_ be ? Get(_rx_, `"lastIndex"`).
1. Perform ? Set(_rx_, `"lastIndex"`, 0, *true*).
1. If SameValue(_previousLastIndex_, 0) is *false*, then
1. Perform ? Set(_rx_, `"lastIndex"`, 0, *true*).
1. Let _result_ be ? RegExpExec(_rx_, _S_).
1. Perform ? Set(_rx_, `"lastIndex"`, _previousLastIndex_, *true*).
1. Let _currentLastIndex_ be ? Get(_rx_, `"lastIndex"`).
1. If SameValue(_currentLastIndex_, _previousLastIndex_) is *false*, then
1. Perform ? Set(_rx_, `"lastIndex"`, _previousLastIndex_, *true*).
1. If _result_ is *null*, return -1.
1. Return ? Get(_result_, `"index"`).
</emu-alg>
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