Regex Tester

Online Regex Tester and Debugger

Writing regular expressions (Regex) is incredibly powerful for string manipulation and data extraction, but notoriously prone to errors. Our Regex Tester allows developers to instantly validate and visualize their regular expressions against custom test strings without writing any extra code.

Visualize Matches and Capture Groups

As you test your pattern, our tool dynamically evaluates the regex engine against your test text. It explicitly highlights exact matches and distinctly separates capture groups. This visual feedback loop makes it incredibly easy to see if your greedy quantifiers, lookaheads, or boundaries are working as intended.

Using Regex Flags

You can easily toggle common regex flags to modify the matching behavior. For example, use the g flag for a global search (finding all matches rather than stopping at the first), the i flag for case-insensitive matching, and the m flag for multi-line support. Understanding these modifiers is key to mastering pattern matching.