Regex Tester
Test your regular expressions with real-time highlighting, match details, and capture group support. Use presets for common patterns.
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What Is a Regular Expression?
A regular expression (regex) is a sequence of characters that defines a search pattern. Regex is used extensively in programming for string matching, validation, search-and-replace, and data extraction.
How to Use This Tester
Enter your regex pattern in the input field, select the desired flags, and type or paste your test string. Matches are highlighted in real time with a colored background. The match details panel below shows each individual match with its position and any capture groups.
Common Regex Patterns
- Email:
[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,} - URL:
https?://[^\s]+ - IPv4 Address:
\b(?:\d{1,3}.)3\d{1,3}\b - Date (YYYY-MM-DD):
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01]) - Phone Number:
[\+]?[(]?[0-9]{1,4}[)]?[-\s\.]?[0-9]{1,4}[-\s\.]?[0-9]{1,9}