Legend

structure

( ) grouping
a|b either a or b

quantifier

? 0 or 1 occurrence
* 0 or any number of occurrences
+ any number of occurrences
{x} x occurrences
{x,y} x to y occurrences

positions

^ / $ line beginning / ending
\b word border position
\B in-word position
(?=x) lookahead if x comes next

characters

. any character
\d / \D digit / any other
\s / \S whitespace / any other
\w / \W alpha-numeric / any other
[ab] any character a or b
[^ab] any character but a and b

About the Project

RegViz is a tool for debugging JavaScript regular expressions in a visual way. The goal of the project is to create a system to make regular expressions more readable. Advanced highlighting helps you to understand the structure and purpose of a regular expression and to detect bugs therein. You can test the regular expression on a sample text and formulate test cases. We tried to come up with a very user friendly tool.

Contact

RegVizβ2

Visual Debugging of Regular Expressions for JavaScript

sample text

clear

matches

0/0

tests matched

additional matches

add test

remove test