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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. 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 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.

正規表現による検索は、一つの段落でのみ実行できます。複数の段落で正規表現による検索を実行するには、段落ごとに検索してください。

関連項目

正規表現のリスト

Using Wildcards in Formulas