REGEXP Checker
Enter a regular expression and text to test for matches.
About Our REGEXP Checker
Our free online REGEXP (Regular Expression) Checker tool allows you to test and validate your regular expressions against sample text. Regular expressions are powerful patterns used for matching character combinations in strings. They are indispensable for developers, data analysts, and anyone who needs to perform complex text searches, validations, or manipulations. This tool helps you build, test, and debug your regex patterns efficiently.
How to Use the REGEXP Checker
- Enter Regular Expression: Type or paste your regular expression into the "Enter Regular Expression" field.
- Enter Text to Test: Paste the text you want to test your regex against into the "Enter Text to Test" textarea.
- Check REGEXP: Click "Check REGEXP" to see if your pattern matches any part of the text. Matches will be highlighted, and the number of matches will be displayed.
Frequently Asked Questions (FAQ)
- What is a regular expression (regex)?
- A regular expression is a sequence of characters that defines a search pattern. It is primarily used for string searching and string manipulation, such as "find and replace" operations.
- Why are regular expressions useful?
- Regular expressions are incredibly powerful for tasks like data validation (e.g., email addresses, phone numbers), parsing log files, extracting specific information from text, and performing complex search and replace operations in code or documents.
- Are there different types of regex syntax?
- While the core concepts are similar, there are slight variations in regex syntax and features across different programming languages and tools (e.g., JavaScript, Python, Perl, PCRE). Our tool uses JavaScript's regex engine.