regex Tester

Gratis online tool test and debug regular expressions instantly. free online regex tester with real-time matching, flags, substitution, and detailed match information. no sign-up needed.

Wat is regex Tester?

A powerful developer tool designed to help you work more efficiently. Regex Tester provides accurate results instantly with a clean, intuitive interface. Perfect for developers, engineers, and IT professionals.

Formule

patroon + vlaggen → regexp → Execute agAInst testtekst → overeenkomsten array

veelvoorkomend patroons:

- \d+ → one or more digits

- [a-zA-Z]+ → one or more letters

- ^…$ → anchors for start/end

- (…) → capture groups

Hoe te berekenen

Enter your input in the field above.
Configure any available options to customize the output.
View the results instantly with real-time updates.
Copy or export your results for use in your projects.

Voorbeeld

patroon: ^[\w.-]+@[\w.-]+\.\w{2,}$ with testtekst: "Contact us at hello@voorbeeld.com or support@test.org" overeenkomsten both emAIl addresses and displays them in the results list.

Belangrijkste voordelen

Get accurate results instantly in your browser.
Save time with real-time calculations as you type.
No data leaves your device - complete privacy.
Free to use on any device, no sign-up required.

Veelgemaakte fouten

Not escAPIng special characters (use \. instead of .)
Forgetting the g flag when expecting multiple overeenkomsten
Gretige kwantificatoren gebruiken terwijl luie nodig zijn
Patronen te ingewikkeld maken — eenvoudig is vaak beter

Pro-tips

Test with both overeenkomsting and non-overeenkomsting tekst
Use online regex references for complex patroons
Begin eenvoudig en voeg stapsgewijs complexiteit toe
Gebruik named capture groups for readability

Sleutelbegrippen

patroon: Search expression
Vlaggen: opties die zoekgedrag wijzigen
overeenkomst: Found occurrence of patroon
Vastleggingsgroep: tussen haakjes geplaatst deel van het patroon

Veelvoorkomende toepassingen

Validating emAIl addresses, phone numbers, URLs
Extracting patroons from tekst (dates, prices, IDs)
Search and replace operations in tekst editors
invoer validation in web forms

Veelgestelde Vragen

What is a reguliere expressie?

A regex is a sequence of characters defining a search patroon. It is used for patroon overeenkomsting in tekst, such as finding emAIl addresses, validating invoer, or extracting data from tekenreekss.

What regex engine does this Gebruik?

This hulpmiddel uses JavaScript's built-in regexp engine, which supports most standard regex features including groups, lookaheads, quantifiers, and character classes.

What are veelvoorkomend regex vlaggen?

g (global): Find all overeenkomsten, not just first. i (case-insensitive): Ignore case. m (multiline): ^ and $ overeenkomst line boundaries. s (dotall): . overeenkomsten newlines.

Why is my regex not overeenkomsting?

veelvoorkomend issues: missing the g flag for multiple overeenkomsten, not escAPIng special characters (., *, +, ?, [, ], (, )), or incorrect quantifier usage.

Gerelateerde tools

Beeldverhouding Rekenmachine

Bandbreedte Rekenmachine

Downloadtijd Rekenmachine

Cloud Hosting Kosten Rekenmachine

CDN Kosten Rekenmachine

API Monetisatie Rekenmachine