Regex Tester
Enter a regex pattern and test text to see all matches, captured groups, and their positions. Supports case-insensitive, multiline, dotall, and unicode flags. Great for validating patterns before using them in code.
Without delimiters (e.g. ^[a-z]+$)
advanced options
i=case-insensitive, m=multiline, s=dotall, u=unicode
Find all matches, not just the first
returns
- data.matches
- Each match with its text, groups, index and length.
- data.is_match
- True when the pattern matched at least once.
- data.match_count
- Number of matches found.
- data.execution_time_ms
- How long the match took, in milliseconds.
Run it from your code
A temporary key takes one request and lasts seven days at 20 calls a day. Register and it becomes 75 a day, still free.
$ curl -sX POST "https://apixies.io/api/v1/test-regex" \ -H "X-API-Key: $APIXIES_KEY" \ -H "Content-Type: application/json" \ -d '{"pattern":"(\\w+)@(\\w+)\\.(\\w+)","text":"..."}' | jq '.data.matches'
questions
Do I need to include delimiters?
No. Enter just the pattern without / delimiters. The API adds them automatically. For example, enter ^[a-z]+$ instead of /^[a-z]+$/.
What flags are supported?
Four flags: i (case-insensitive), m (multiline, ^ and $ match line boundaries), s (dotall, . matches newlines), and u (unicode mode).
Is there protection against slow patterns?
Yes. The regex engine has a backtracking limit to prevent ReDoS (Regular Expression Denial of Service) attacks. Patterns that cause excessive backtracking return an error instead of hanging.