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Add rule to warn about misused regexp backreferences #617

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ajafff opened this issue May 14, 2019 · 0 comments
Open

Add rule to warn about misused regexp backreferences #617

ajafff opened this issue May 14, 2019 · 0 comments
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good first issue help wanted rule suggestion

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@ajafff ajafff commented May 14, 2019

Backreferences referencing a (named) capture group declared after the reference always expand to an empty string. They are in fact forwardreferences.

/^\1(.)$/.test('aa'); // doesn't match
/^\k<name>(?<name>.)$/.test('a'); // matches only a single character

Related: #615
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