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RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).

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Build a suite of tests that your expression should (or should not) match.

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Character classes
.	any character except newline
小火箭ios下载	word, digit, whitespace
\W \D \S	not word, digit, whitespace
[abc]	any of a, b, or c
[^abc]	not a, b, or c
[a-g]	character between a & g
Anchors
^abc$	start / end of the string
\b \B	word, not-word boundary
Escaped characters
\. \* \\	escaped special characters
\t \n \r	tab, linefeed, carriage return
Groups & Lookaround
(abc)	shadowrocket在线安装
\1	小火箭ios下载
(?:abc)	non-capturing group
shadowsock下载 ios	positive lookahead
(?!abc)	negative lookahead
Quantifiers & Alternation
a* a+ a?	0 or more, 1 or more, 0 or 1
a{5} a{2,}	exactly five, two or more
a{1,3}	between one & three
a+? a{2,}?	match as few as possible
ab\|cd	match ab or cd

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