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# Using Regular Expressions in Text Searches

Regular expressions can be used to search for some unspecified or even invisible characters.

Searching with regular expressions is different from searching with wildcards. LibreOffice Writer only supports searching with regular expressions.

You can use regular expressions when you find and replace text in a document. For example, "s.n" finds "sun" and "son".

1. Vaya a Editar ▸ Buscar y reemplazar.

2. Pulse en Más opciones para ampliar el cuadro de diálogo.

3. Seleccione la casilla de verificación Expresiones regulares.

4. In the Find box, type the search term and the regular expression(s) that you want to use in your search.

5. Pulse en Buscar siguiente o en Buscar todo.

## Ejemplos de expresiones regulares

1. The regular expression for a single character is a period (.).

2. The regular expression for zero or more occurrences of the previous character is an asterisk. For example: "123*" finds "12" "123", and "1233".

3. The regular expression combination to search for zero or more occurrences of any character is a period and asterisk (.*).

4. The regular expression for the end of a paragraph is a dollar sign ($). The regular expression character combination for the start of a paragraph is a caret and a period (^.).

5. The regular expression for a tab character is \t.

Una busqueda que utilice una expresión regular funcionará solo dentro de un párrafo. Para buscar en más de un párrafo mediante expresiones regulares, realice una búsqueda separada por cada uno de los párrafos.

Temas relacionados

List of regular expressions