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Regex Validator
Regex Syntax Validator
Instantly verify the integrity and compatibility of your regular expression patterns
SYNTAX PRO
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About the Regex Validator
Check that a regular expression is valid and see whether it works as you expect.
How to use the Regex Validator
- Enter the Regex Pattern and the Flags (such as g, i or m).
- Press Validate Syntax Integrity.
- Read the result and fix any error reported.
Worked example
^([a-zA-Z]+)$ matches "Hello" but not "Hello1", because digits are not allowed.
Tips
- Flags: g = all matches, i = ignore case, m = multiline.
- Unbalanced brackets and unescaped special characters are the most common errors.
Frequently Asked Questions
It makes the pattern ignore upper and lower case.