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Copy file name to clipboardexpand all lines: POSIX.md
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# [POSIX] Standard Regular Expressions
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## [中文文档](/POSIX-CN.md"Chinese documentation")
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Regular expressions mainly have [PCRE] and [POSIX] two standards, The [POSIX] standard has five favors: BRE (Basic Regular Expressions), GNU BRE, ERE (Extended Regular Expressions), GNU ERE, and the deprecated SRE (Simple Regular Expressions). The syntax is not consistent between each other.
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Since the [PCRE] standard is widely supported by various popular programming languages, the regular expressions in this project are all [PCRE]. The [POSIX] standard is currently supported primarily by various Unix-like system built-in commands, such as `awk`, `sed` and other commands in Linux.
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