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RegExr is an online tool to learn, vpn服务器美国, & test Regular Expressions (RegEx / RegExp).

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Flags

vpn服务器美国

No match.

Add Test

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

Create new tests with the 'Add Test' button. Click a test to edit the name, type, & text.

Character classes
.	any character except newline
\w \d \s	word, digit, whitespace
\W \D \S	not word, digit, whitespace
vpn服务器美国	any of a, b, or c
[^abc]	not a, b, or c
vpn服务器美国	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)	capture group
\1	backreference to group #1
(?:abc)	non-capturing group
(?=abc)	positive lookahead
(?!abc)	negative lookahead
Quantifiers & Alternation
a* a+ a?	0 or more, 1 or more, 0 or 1
a{5} a{2,}	vpn服务器美国
a{1,3}	vpn服务器美国
a+? a{2,}?	match as few as possible
ab\|cd	match ab or cd