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[Regular Expressions] Single opening bracket in charsets is scoped punctuation #417

@deathaxe

Description

@deathaxe

What happened?

A single opening [ may appear unescaped in charsets and thus should not be scoped punctuation.definition.set.

[[]

It becomes punctuation not before valid nestedcharset is present.

[[:alpha:]]

or

[[A-Z]-[0-9]]

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