🎯 Regular Expression Tester

Test regular expressions online with real-time match highlighting

💡 Enter regular expression and test text to see matches in real-time

Regular Expression

Flags

g (global match)

i (case insensitive)

m (multiline mode)

s (single line mode)

Test Text

Match Results

📚 User Guide

Regular Expression Basics

. - Match any single character
* - Match previous character 0 or more times
+ - Match previous character 1 or more times
? - Match previous character 0 or 1 time
^ - Match start of string
$ - Match end of string
[] - Character set
() - Grouping
| - OR operator

Common Character Classes

\d - Digit, equivalent to [0-9]
\w - Word character, equivalent to [A-Za-z0-9_]
\s - Whitespace character (space, tab, etc.)
\D - Non-digit
\W - Non-word character
\S - Non-whitespace character

Quantifiers

{n} - Match exactly n times
{n,} - Match at least n times
{n,m} - Match between n and m times

Flag Descriptions

g - Global match, find all matches
i - Case insensitive
m - Multiline mode, ^ and $ match start/end of each line
s - Single line mode, . matches all characters including newline

Practical Examples

Phone: 1[3-9]\d{9}
Email: [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}
URL: https?://[\w\-]+(\.[\w\-]+)+([\w\-.,@?^=%&:/~+#]*[\w\-@?^=%&/~+#])?
IP Address: (\d{1,3}\.){3}\d{1,3}
Chinese Characters: [\u4e00-\u9fa5]