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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. 選擇 [編輯] - [尋找與取代]。

2. 按一下 [更多選項] 展開對話方塊。

3. 選取「常規表述式」核取方塊。

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.

## 常規表述式範例

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.

使用常規表述式進行搜尋僅適用於某個段落內。若要在多個段落中使用常規表述式進行搜尋，則請在每個段落中執行個別的搜尋。

相關主題

常規表述式的清單

Using Wildcards in Formulas