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[libc++] `<regex>`: Optional empty repetitions should not match #133314

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Alcaro opened this issue Mar 27, 2025 · 0 comments

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libc++ regex

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Alcaro commented Mar 27, 2025 •

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> /(a?)+/.exec("aaa")
Array [ "aaa", "a" ]
> /((b)?(be)?)+bbee/.exec("bbebbee")
Array(4) [ "bbebbee", "bbe", "b", "be" ]

~Firefox

But in libc++, the equivalent operations return [ "aaa", "" ] and [ "bbebbee", "", undefined, undefined ].

Full example: https://godbolt.org/z/zYYenvEdb (blatantly modified from microsoft/STL#5365)

The text was updated successfully, but these errors were encountered:

llvmbot added the libc++ label

philnik777 added the regex label

Alcaro mentioned this issue

[libc++] <regex>: Undefined backreferences should match empty string #133360

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