Regex Tester
Test regular expressions against any text. See all matches, capture groups, and indexes live as you type.
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Knowledge Base
Frequently Asked Questions
What is a regular expression?↓
A regular expression (regex) is a sequence of characters that defines a search pattern. They are used for string matching, validation, and text manipulation in virtually every programming language.
What do the regex flags do?↓
The 'g' flag finds all matches (not just the first). 'i' makes matching case-insensitive. 'm' makes ^ and $ match line starts/ends. 's' (dotAll) makes the dot (.) also match newline characters.
What are capture groups?↓
Capture groups are parts of a regex wrapped in parentheses, e.g. (\d+). When a match is found, the text matched by each group is extracted separately, which is useful for parsing structured data.
Can I use this for email or URL validation?↓
Yes. Use the Quick Patterns dropdown to load pre-built patterns for common formats like email addresses, URLs, phone numbers, dates, and IP addresses, then adjust them to your needs.