Ada
index 0$1
Ada
name
Ada
Regex Tester
Test regular expressions instantly, highlight matches, inspect capture groups, and preview replacements.
Supports common JavaScript Regex flags. Without g, only the first match is shown and replace only updates the first match.
Pattern and test text
Enter a regular expression, choose flags, then paste the text to inspect.
//
Flags
Matches
4
Groups
8
Flags
g
Match highlight
Matched text is highlighted so you can quickly verify the pattern targets the right ranges.
Ada builds tools. Grace reviews Regex patterns. Linus tests replacements.
Capture groups
Review every match position, numbered group, and named group.
Grace
index 18$1
Grace
name
Grace
Regex
index 32$1
Regex
name
Regex
Linus
index 48$1
Linus
name
Linus
Replace preview
Preview replacements using the current pattern, flags, and replacement string.
[Ada] builds tools. [Grace] reviews [Regex] patterns. [Linus] tests replacements.