🔍 Regex Tester

Test and debug regular expressions with live matching and explanations

Regular Expression
/ /
Flags:
g (global)
i (ignore case)
m (multiline)
s (dotall)
Test String
Match Results
0
Matches
0
Groups
Invalid
Regex Status
Enter a regex pattern and test string to see matches
Actions
Common Regex Patterns
Email Validation
[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}
Matches valid email addresses
Phone Number
\(?(\d{3})\)?[-.\s]?(\d{3})[-.\s]?(\d{4})
US phone number formats
URL Matching
https?:\/\/[^\s]+
HTTP and HTTPS URLs
Date Format
\d{1,2}\/\d{1,2}\/\d{4}
MM/DD/YYYY date format
Regex Reference
.
Any character except newline
*
0 or more repetitions
+
1 or more repetitions
?
0 or 1 repetition
\d
Any digit (0-9)
\w
Any word character
\s
Any whitespace character
^
Start of string
$
End of string
[abc]
Character set (a, b, or c)
(group)
Capturing group
|
Alternation (OR)

🔍 Complete Guide to Regex Tester

Test regular expressions instantly - validate and debug regex patterns

A Regex Tester is an essential tool for developers to test and debug regular expressions. Whether you're validating input, parsing text, or searching patterns, our regex tester provides instant testing with match highlighting and detailed explanations.

🎯 What is Regex?

Regular expressions (regex) are patterns used to match character combinations in strings. They're powerful tools for text processing, validation, and search operations in programming.

Example: /\d{3}-\d{3}-\d{4}/ matches phone numbers like 123-456-7890

🔑 Key Features

  • Live Testing: See matches in real-time
  • Match Highlighting: Visual match indicators
  • Flags Support: Global, case-insensitive, multiline
  • Match Details: See all matches and groups
  • Error Detection: Identify regex syntax errors
  • Examples: Common regex patterns included
  • Always Free: No subscriptions

💡 Common Uses

  • Validation: Email, phone, URL validation
  • Text Parsing: Extract data from strings
  • Search & Replace: Find and replace patterns
  • Data Extraction: Parse logs and files
  • Form Validation: Validate user input
  • Text Processing: Clean and format text

❓ FAQ

What do regex flags mean?

g (global): Find all matches, not just first. i (case-insensitive): Ignore case. m (multiline): ^ and $ match line starts/ends.

How do I escape special characters?

Use backslash (\) before special characters: . * + ? ^ $ { } [ ] ( ) | \. Example: \. matches a literal period.

What are capture groups?

Parentheses () create capture groups that extract matched portions. Example: /(\d{3})-(\d{3})/ captures area code and prefix separately.

Are regex patterns universal?

Most regex syntax is standard, but some features vary between languages (JavaScript, Python, Java). Our tester uses JavaScript regex syntax.

Common Regex Patterns

Email: /^[\w.-]+@[\w.-]+\.\w+$/

Phone: /\d{3}-\d{3}-\d{4}/

URL: /https?:\/\/[\w.-]+/

Digits: /\d+/

Letters: /[a-zA-Z]+/

Start testing regex now - perfect patterns are just one click away!