Regex Tester

Test regex patterns with live matching, substitution, and code generation

Pro Tip: Test Before You Deploy

Use Match mode to verify your pattern, Substitute mode to test replacements, and Code Generator to export implementation-ready code in 7+ languages.

Regular Expression Pattern

Flags:

Quick patterns:

Test String

📖 Regex Quick Reference

📝Character Classes

\d - any digit (0-9)
\D - non-digit
\w - word char (a-z, A-Z, 0-9, _)
\W - non-word char
\s - whitespace
\S - non-whitespace
. - any character (except \n)
[abc] - a, b, or c
[^abc] - not a, b, or c
[a-z] - characters from a to z

🔢Quantifiers

* - 0 or more
+ - 1 or more
? - 0 or 1
{n} - exactly n
{n,} - n or more
{n,m} - between n and m
*? - lazy (0 or more)
+? - lazy (1 or more)

📍Anchors & Boundaries

^ - start of string/line
$ - end of string/line
\b - word boundary
\B - not word boundary
\A - start of string
\Z - end of string

🔗Groups & Lookaround

(abc) - capture group
(?:abc) - non-capturing group
(?=abc) - positive lookahead
(?!abc) - negative lookahead
(?<=abc) - positive lookbehind
(?<!abc) - negative lookbehind
\1 - backreference to group 1

⚡Special

| - alternation (or)
\ - escape special char
\n - newline
\r - carriage return
\t - tab
\0 - null character

🚩Flags

g - global (find all)
i - case insensitive
m - multiline (^ and $ match lines)
s - dotall (. matches \n)
u - unicode
y - sticky

Related Tools

Find & Replace

Search and replace text with regex support

Text Obfuscator

Obfuscate text with ROT13, Base64, and more

About Regular Expressions

Regular expressions (regex) are patterns used to match character combinations in strings. They're essential tools for developers for validation, searching, and text manipulation.

Common Use Cases

•Email and phone validation
•Text pattern matching and extraction
•Data parsing and validation
•Search and replace operations

Read the Complete Guide

← Back to All Tools

About Regular Expressions

Regular expressions (regex) are patterns used to match character combinations in strings. They're essential tools for developers for validation, searching, and text manipulation.

Common Use Cases

•Email and phone validation

•Text pattern matching and extraction

•Data parsing and validation

•Search and replace operations

Read the Complete Guide