Regex Visualizer - Free Online | FunToolX
Use Regex Visualizer online for free, no download required. FunToolX offers hundreds of fun online tools.
Regex Visualizer
Enter a regular expression to render a match diagram (railroad), and test text against it in real time.
About this tool
Regex Visualizer is a free online tool. Turn a regular expression into a match diagram — an intuitive way to learn and debug complex regex.
Enter a regular expression, and the tool parses the syntax structure and generates a visual diagram: showing the matching logic, branches, repeats, capture groups, etc. for each part. It can be displayed in the form of a Railroad Diagram or a syntax tree. Hover over a section of the chart highlights the corresponding regular segment.
The regular parser decomposes the expression into tokens (literals, character classes, quantifiers, groups, etc.) and then builds an abstract syntax tree (AST). Visually draw a railway diagram using SVG, with each node representing a matching state and edges representing transition conditions.
Good for understanding complex regular expressions, especially those written by others or copied from the web. Logical structure is easier to see than plain text. It is also used for teaching to demonstrate how regularization works.
A regular expression visualization tool that converts regular expressions into a graphical state machine or syntax tree to help understand complex regular expressions.