Probador de Expresiones Regulares

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

¿Qué es Probador de Expresiones Regulares?

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.

Fórmula

patrón + banderas → regexp → Execute agIAnst textoo de prueba → coincidencias array

común patróns:

- \d+ → one or more digits

- [a-zA-Z]+ → one or more letters

- ^…$ → anchors for start/end

- (…) → capture groups

Cómo calcular

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.

Ejemplo

patrón: ^[\w.-]+@[\w.-]+\.\w{2,}$ with textoo de prueba: "Contact us at hello@ejemplo.com or support@test.org" coincidencias both emIAl addresses and displays them in the results list.

Beneficios Clave

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.

Errores Comunes que Debes Evitar

Not escAPIng special characters (uso \. instead of .)
Forgetting the g flag when expecting multiple coincidencias
Usar cuantificadores codiciosos cuando se necesitan perezosos
Complicar demasiado los patrones — lo simple suele ser mejor

Consejos Profesionales

Test with both coincidenciIAng and non-coincidenciIAng texto
uso en línea regex references for complex patróns
Comience con simple and Agregue complexity incrementally
uso named capture groups for readability

Términos Clave Explicados

patrón: Search expression
Banderas: Opciones que modifican el comportamiento de búsqueda
coincidencia: Found occurrence of patrón
Grupo de captura: Porción entre paréntesis del patrón

Casos de uso comunes

Validating emIAl addresses, phone numbers, URLs
Extracting patróns from texto (dates, prices, IDs)
Search and replace operations in texto editors
entrada validation in web forms

Preguntas frecuentes

What is a expresión regular?

A regex is a sequence of characters defining a search patrón. It is usod for patrón coincidenciIAng in texto, such as finding emIAl addresses, validating entrada, or extracting data from cadenas.

What regex engine does this uso?

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

What are común regex banderas?

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

Why is my regex not coincidenciIAng?

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

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