Regex Tester
Online

Regular expressions (regex) are patterns used to search and manipulate text. They let you match strings by complex rules — for example, extracting all email addresses from a document or validating a phone number format.

Popular ones include \d+ for numbers, \w+ for words, ^...$ to match an entire string, and .* for any sequence of characters. Square brackets [abc] define a set of allowed characters.

The g flag enables global search for all matches, i makes the search case-insensitive, m turns ^ and $ into per-line anchors, and s allows the dot to match newline characters.

Enter your pattern and test text into this tool — matches are highlighted instantly. This helps you debug the expression before embedding it in your program.