ToolsRegex Cheatsheet

Regex Cheatsheet

Syntax reference

Regex Cheatsheet

Syntax reference

Character Classes

.Any character except newline

\wWord character (a-z, A-Z, 0-9, _)

\dDigit (0-9)

\sWhitespace (space, tab, newline)

[abc]Any of a, b, or c

[^abc]Not a, b, or c

[a-z]Character between a and z

Anchors

^Start of string/line

$End of string/line

\bWord boundary

Quantifiers

*0 or more

+1 or more

?0 or 1

{3}Exactly 3

{3,}3 or more

{3,5}3, 4, or 5

Groups & Lookaround

(...)Capturing group

(?:...)Non-capturing group

(?=...)Positive lookahead

(?!...)Negative lookahead

Flags

gGlobal search

iCase-insensitive

mMulti-line search

Regex Cheatsheet

A quick reference guide for common regular expression syntax, including character classes, quantifiers, and anchors.

How to Use

Browse the list to find the regex token you need.

Examples to try

Use these sample inputs and outputs with Regex Cheatsheet.

-Example 1: Start with a small input to validate the format.
-Example 2: Try a real-world payload to confirm the output.
-Example 3: Compare the result against your expected structure.

Common pitfalls

Avoid these mistakes when using Regex Cheatsheet.

-Mixing formats or encodings in a single input.
-Copying output without reviewing edge cases.
-Skipping validation before sharing the result.

Keywords

regex cheatsheetregular expression referenceregex syntax guideregex patternsregex quick reference

Frequently Asked Questions

Is this for JS?

Yes, optimized for JavaScript RegExp flavor.

Does it cover flags and groups?

Yes, it includes common flags, groups, and character classes.

Does it cover lookarounds?

Includes common lookahead/behind patterns.

Is it JavaScript-specific?

Examples are tuned for JS regex.

常见问题

正则速查表是免费的吗？

是的，正则速查表免费使用，并且直接在浏览器中运行。

数据会上传吗？

不会，大部分处理在本地完成；如果需要联网会明确提示。

正则速查表支持哪些格式？

正则速查表 supports the common formats described on the page. Convert uncommon formats before pasting.

如何分享正则速查表的结果？

Copy the output and review any sensitive data before sharing or publishing.

ToolsRegex Cheatsheet

Regex Cheatsheet

Syntax reference

Regex Cheatsheet

Syntax reference

Character Classes

.Any character except newline

\wWord character (a-z, A-Z, 0-9, _)

\dDigit (0-9)

\sWhitespace (space, tab, newline)

[abc]Any of a, b, or c

[^abc]Not a, b, or c

[a-z]Character between a and z

Anchors

^Start of string/line

$End of string/line

\bWord boundary

Quantifiers

*0 or more

+1 or more

?0 or 1

{3}Exactly 3

{3,}3 or more

{3,5}3, 4, or 5

Groups & Lookaround

(...)Capturing group

(?:...)Non-capturing group

(?=...)Positive lookahead

(?!...)Negative lookahead

Flags

gGlobal search

iCase-insensitive

mMulti-line search

Regex Cheatsheet

A quick reference guide for common regular expression syntax, including character classes, quantifiers, and anchors.

How to Use

Browse the list to find the regex token you need.

Examples to try

Use these sample inputs and outputs with Regex Cheatsheet.

-Example 1: Start with a small input to validate the format.
-Example 2: Try a real-world payload to confirm the output.
-Example 3: Compare the result against your expected structure.

Common pitfalls

Avoid these mistakes when using Regex Cheatsheet.

-Mixing formats or encodings in a single input.
-Copying output without reviewing edge cases.
-Skipping validation before sharing the result.

Keywords

regex cheatsheetregular expression referenceregex syntax guideregex patternsregex quick reference

Frequently Asked Questions

Is this for JS?

Yes, optimized for JavaScript RegExp flavor.

Does it cover flags and groups?

Yes, it includes common flags, groups, and character classes.

Does it cover lookarounds?

Includes common lookahead/behind patterns.

Is it JavaScript-specific?

Examples are tuned for JS regex.

Regex Cheatsheet

Regex Cheatsheet

Regex Cheatsheet

How to Use

Examples to try

Common pitfalls

Keywords

Frequently Asked Questions

Is this for JS?

Does it cover flags and groups?

Does it cover lookarounds?

Is it JavaScript-specific?

关于正则速查表

使用说明

常见问题

正则速查表是免费的吗？

数据会上传吗？

正则速查表支持哪些格式？

如何分享正则速查表的结果？

Regex Cheatsheet

Regex Cheatsheet

Regex Cheatsheet

How to Use

Examples to try

Common pitfalls

Keywords

Frequently Asked Questions

Is this for JS?

Does it cover flags and groups?

Does it cover lookarounds?

Is it JavaScript-specific?

Regex Cheatsheet

Regex Cheatsheet

Regex Cheatsheet

How to Use

Examples to try

Common pitfalls

Keywords

Frequently Asked Questions

Is this for JS?

Does it cover flags and groups?

Does it cover lookarounds?

Is it JavaScript-specific?

关于正则速查表

使用说明

常见问题

正则速查表是免费的吗？

数据会上传吗？

正则速查表 支持哪些格式？

如何分享 正则速查表 的结果？

Regex Cheatsheet

Regex Cheatsheet

Regex Cheatsheet

How to Use

Examples to try

Common pitfalls

Keywords

Frequently Asked Questions

Is this for JS?

Does it cover flags and groups?

Does it cover lookarounds?

Is it JavaScript-specific?

正则速查表支持哪些格式？

如何分享正则速查表的结果？