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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. 編集 → 検索と置換を選択します。

2. ダイアログを展開するには、詳細オプションをクリックします。

3. 正規表現チェックボックスを選択します。

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

5. Click Find Next or Find All.

## 正規表現の例

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

関連項目

正規表現のリスト

改行記号の削除

Using Wildcards in Formulas

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