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Regex Generator — Free Online Tool
Generate common JavaScript regex shapes for email-like strings, digits, URLs, dates or safely escaped literal text.
JavaScript is needed for the interactive tool. The formula and worked example remain available below.
How to use the Regex Generator
Generate common JavaScript regex shapes for email-like strings, digits, URLs, dates or safely escaped literal text.
- Enter real measurements or prices in the interactive tool.
- Check unit labels and customize any applicable fees, waste allowances or product-specific rates.
- Review the result, formulas and limitations before using it in purchasing, pricing or production decisions.
Regex Generator: formula & methodology
Choose a pattern template; optionally anchor with ^ and $, and add g or i flags for global or case-insensitive matching.
The tool uses your entered values and explicitly labeled assumptions. Final results may be rounded for display, while intermediate arithmetic retains available numeric precision. Verify material, tax, device or platform specifications relevant to your situation.
Worked example
For five digit ZIP-style patterns, the template is \d{5}(?:-\d{4})?. Anchoring makes it require a full-string match.
Try the example above and then change values to reflect your own project or comparison.
Frequently asked questions
Are the templates full validators?
No. Email, URL and date templates match common formats but are not full standards-based validation.
What does matching the whole string mean?
It anchors the expression at the start and end of the input rather than finding a matching substring.
Can I use the output in Python?
The generator creates JavaScript regex syntax. Other regex flavors can differ in escapes and flag support.