Tools

Regex Tester & Creator Tool — Build and Test Regular Expressions

Use our Regex Tester and Creator Tool to write, validate, and debug regular expressions in real time. Paste sample text, add your pattern, choose flags, and instantly see highlighted matches with detailed explanations.

Regular Expression

Regex Options

Global (g)

Ignore Case (i)

Multiline (m)

Dot All (s)

Replacement

Test Cases

test@example.com

123-45-6789

+1 (555) 123-4567

https://example.com/path

Test String

0 matches

Results

// Results will appear here after testing

Match Information

No matches yet. Enter a regex and test string to see match details.

Regex Cheat Sheet

Character Classes

. Any character except newline
\w Word character
\d Digit
\s Whitespace
[abc] Any of a, b, or c
[^abc] Not a, b, or c

Quantifiers

a* Zero or more of a
a+ One or more of a
a? Zero or one of a
a{3} Exactly 3 of a
a{3,} 3 or more of a
a{3,5} 3 to 5 of a

Anchors

^ Start of string
$ End of string
\b Word boundary
\B Not word boundary

Groups & Lookaround

(abc) Capture group
(?:abc) Non-capturing group
a(?=b) Positive lookahead
a(?!b) Negative lookahead
(?<=a)b Positive lookbehind
(?

Common Regex Patterns

Email Address

\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b

URL

https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)

Phone Number

(\+\d{1,3}\s?)?($?\d{3}$?[\s.-]?)?\d{3}[\s.-]?\d{4}

IP Address

\b(?:\d{1,3}\.){3}\d{1,3}\b

Date (YYYY-MM-DD)

\d{4}-\d{2}-\d{2}

Credit Card

\b(?:\d{4}[- ]?){3}\d{4}\b

About Regular Expressions

Regular expressions (regex or regexp) is a powerful patterns used to match character combinations in strings. Regex are supported in most popular programming languages, text editors, and tools for searching, validating, and manipulating text.

Common Uses of Regex

Data validation (emails, phone numbers, etc.)
Search and replace operations
String parsing and extraction
Syntax highlighting
Data scraping and transformation

Tips for Effective Regex

Test your regex with various inputs to ensure it matches what you expect
Use non-capturing groups (?:...) when you don't need to extract the matched content
Be specific with your patterns to avoid unintended matches
Use anchors ^ and $ when you want to match the entire string
Comment complex regex patterns for better maintainability