PromptTools.dev
Start getting better AI results today
Analyze PromptTest Across 6 Models

Regex Tester & Generator

Test regular expressions with live matching or generate regex patterns for common use cases like emails, URLs, and AWS WAF rules.

Available Flags:

g- Global
i- Case-insensitive
m- Multiline
s- DotAll
u- Unicode
y- Sticky
Advertisement (728×90)

How it works

1.

Choose Mode

Test existing regex or generate new patterns.

2.

Enter Pattern/Text

Type your regex or select a pattern to generate.

3.

Test & Validate

See matches in real-time with flag explanations.

Common use cases

→

Email Validation

Test regex patterns for email validation.

→

AWS WAF Rules

Generate regex for AWS WAF to match specific hosts or URL paths.

→

Data Extraction

Extract specific patterns from text or logs.

→

String Replacement

Test patterns before using in code.

Frequently asked questions

What are regex flags?

Flags modify regex behavior: g (global - find all matches), i (case-insensitive), m (multiline - ^ and $ match line boundaries), s (dotAll - . matches newlines), u (unicode), y (sticky - match from lastIndex).

How do I use this for AWS WAF?

Generate a pattern (like URL or custom), then use it in AWS WAF regex pattern sets. For host-only matching, use patterns like ^example\.com$ in the Host header condition.

Do I need to escape special characters?

Yes. Characters like . * + ? ^ $ { } ( ) | [ ] \ need to be escaped with backslash (\).

Is my data stored?

No. All testing happens in your browser.

Start getting better AI results today
Analyze PromptTest Across 6 Models