Real-Time Regex Tester & Visualizer
Test, visualize, and debug regular expressions with live match highlighting, capture group parsing, regex flags support, pattern explanation, and regex replacement simulation.
Real-Time Regex Tester & Visualizer
Test, debug, and validate regular expressions against test text in real time with visual match highlighting, capture group extraction, and pattern replacement.
Total Matches Found (2)
| # | Match Position | Match Length | Matched Value | Capture Groups |
|---|---|---|---|---|
| 1 | pos 40 | 19 chars | support@webiodd.com | — |
| 2 | pos 63 | 23 chars | dev.ops@cluster-node.io | — |
How to Test & Debug Regular Expressions
- 1
Enter your regular expression pattern in the pattern input box without enclosing slashes.
- 2
Toggle regex flags (g = Global, i = Case-Insensitive, m = Multiline, s = DotAll, u = Unicode) as needed.
- 3
Type or paste test data into the test string editor to see real-time highlighted matches.
- 4
Inspect the Capture Groups breakdown table and test string substitution in the Replace Simulator.
Regular Expressions (RegEx) FAQ
What do the regex flags (g, i, m, s, u) mean?
'g' finds all matches rather than stopping at the first; 'i' ignores letter casing; 'm' treats start (^) and end ($) per line; 's' allows dot (.) to match newlines; 'u' enables full Unicode support.
How do capture groups work in regex substitution?
Parentheses (pattern) define capture groups that can be referenced in replacements as $1, $2, etc., allowing precise reformatting of matched strings.
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