This proposal is developed on GitHub with the help of the ECMAScript community. There are a number of ways to contribute to the development of this specification:
The descriptions below use the following variables:
(pattern character that is matched by the
(terminal of the
"s"and otherwise is
"i"and otherwise is
"m"and otherwise is
"u"and otherwise is
Furthermore, the descriptions below use the following internal data structures:
With parameter direction.
The abstract operation BackreferenceMatcher takes two arguments, an integer n and an integer direction, and performs the following steps:
|[[StartIndex]]||An integer ≥ 0.||The number of code units from the start of a string at which the match begins (inclusive).|
|[[EndIndex]]||An integer ≥ [[StartIndex]].||The number of code units from the start of a string at which the match ends (exclusive).|
The abstract operation RegExpBuiltinExec with arguments R and S performs the following steps:
"g", let global be
"y", let sticky be
"u", let fullUnicode be
"length"property is n + 1.
The abstract operation GetStringIndex with with arguments S, Input, and e performs the following steps:
The abstract operation GetMatchString with arguments S and match performs the following steps:
The abstract operation GetMatchIndicesArray with arguments S and match performs the following steps:
The abstract operation MakeGetIndices with argument S performs the following steps:
A GetIndices function is an anonymous built-in function with [[InputString]], [[GroupNames]], [[MatchIndices]], and [[MatchIndicesArray]] internal slots. When a GetIndices function that expects no arguments is called it performs the following steps:
"length"property is n.
© 2019 Ron Buckton, Ecma International
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