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# Using Regular Expressions in Text Searches

Regular expressions are special patterns used to find and manipulate text, helping you locate specific information within texts.

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. Trieu Edita ▸ Busca i reemplaça.

2. Feu clic a Més opcions per ampliar el diàleg.

3. Activeu la casella de selecció Expressions regulars.

4. Al quadre Cerca escriviu el terme de cerca i les expressions regulars que voleu utilitzar en la cerca.

5. Feu clic a Busca el següent o a Busca-ho tot.

## Exemples d'expressions regulars

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

2. The regular expression for a word character \w, and \d for a decimal digit.

3. L'expressió regular per a zero o més aparicions del caràcter anterior és un asterisc. Per exemple, «123*» troba «12» «123» i «1233».

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

5. The regular expression for one or more occurrences of the previous character is a plus sign (+). For example: "\w+" finds any word, "\d+" any number.

6. The regular expression for a tab character is \t. More generally, \s stands for all kinds of "spaces", like non-breaking space, carriage return ...

7. The regular expression for the end of a paragraph is a dollar sign ($). The regular expression for the start of a paragraph is a caret and a period (^.). The regular expression for an empty paragraph is ^$.

A search using a regular expression will work only within one paragraph. That is, a \n will match a line break within a paragraph.

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Llista d'expressions regulars

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Using Wildcards in Formulas