The POSIX standard does not support back-references for "extended" regular expressions, this is a compatible extension to that standard.
POSIX标准并不支持“扩展”正则表达式的后向引用，这是对标准的兼容扩展。
The POSIX standard does not support back-references for "extended" regular expressions, this is a compatible extension to that standard.
POSIX标准并不支持“扩展”正则表达式的后向引用，这是对标准的兼容扩展。
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