Regex Tester

A Regular Expression (Regex) defines a search pattern for strings. It is used for string searching, input validation, and text replacement. Test your regex patterns in real-time with this tool.

What are some common regex patterns?

Email: ^[\w.-]+@[\w.-]+\.[a-zA-Z]{2,}$ / URL: ^https?:\/\/[\w.-]+(:[0-9]+)?(\/.*)?$ / Numbers only: ^[0-9]+$ / Alphanumeric: ^[a-zA-Z0-9]+$ / Date (YYYY-MM-DD): ^\d{4}-\d{2}-\d{2}$

What are regex flags (g, i, m)?

g (global): Find all matches in the string. i (case-insensitive): Match regardless of case. m (multiline): ^ and $ match the start/end of each line. Multiple flags can be combined (e.g., gi).

Where are regular expressions used?

Regex is used for email/phone/URL validation, log file analysis, text editor find-and-replace, string processing in programming languages, and data extraction in web scraping.

What are some common regex patterns?

Email: ^[\w.-]+@[\w.-]+\.[a-zA-Z]{2,}$ / URL: ^https?:\/\/[\w.-]+(:[0-9]+)?(\/.*)?$ / Numbers only: ^[0-9]+$ / Alphanumeric: ^[a-zA-Z0-9]+$ / Date (YYYY-MM-DD): ^\d{4}-\d{2}-\d{2}$

What are regex flags (g, i, m)?

g (global): Find all matches in the string. i (case-insensitive): Match regardless of case. m (multiline): ^ and $ match the start/end of each line. Multiple flags can be combined (e.g., gi).

Where are regular expressions used?

Regex is used for email/phone/URL validation, log file analysis, text editor find-and-replace, string processing in programming languages, and data extraction in web scraping.