Quick start
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Enter pattern
No surrounding slashes; e.g. \d+ for digits.
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Set flags
Common: g global, m multiline, i ignore case.
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Inspect matches
Results show index and groups; optional replace preview.
Regex Tester
Enter a pattern and test string to see matches instantly. Supports flags and replace preview for log parsing and validation rules.
Privacy: processed locally, never uploaded.
↓ Paste in the input area below to see results instantly
Pattern
Flags
Replace (optional)
Found 2 match(es).
Test string
Enter the text to test against your pattern.
Output
Matches
#1 @16: "100" #2 @30: "2026"
Notes
Match notes
Found 2 match(es).
Enter a pattern and test string to see matches instantly. Supports flags and replace preview for log parsing and validation rules.
When to use
Validate form rules, parse logs, or extract API fields before shipping regex to code.
Typical Workflow
Typical use cases for the regex tester include: when you need to quickly verify if a regular expression matches the expected text pattern. Simply enter your expression and test text here. For example, checking if an email format regex works during development, or filtering specific error messages when processing logs.
The workflow is straightforward: 1) Enter your regex at the top; 2) Paste test text in the middle box; 3) View real-time matches. Matches are highlighted, and capture groups are listed separately. You can also test replacement operations, which is particularly useful for batch text modifications.
Examples
Match digits
Input
Towalles 2026
pattern: \d+ matches 2026
FAQ
Why no matches?
Check if you need the g flag, or escape metacharacters (e.g. \. for a dot).
Why does my regex fail to match in some cases?
Common reasons include: 1) Not accounting for multiline patterns (need 'm' flag); 2) Unescaped special characters like '.' or '*'; 3) Case sensitivity (add 'i' flag to ignore case). Use the tool's highlighting feature to debug step-by-step, or refer to our regex cheat sheet.