📅 最后修改于: 2020-11-19 08:01:14 🧑 作者: Mango
正则表达式是字符的特殊序列，可帮助您匹配或查找其他字符串或字符串集，使用的模式举办了专门的语法。它们可用于搜索，编辑或处理文本和数据。
下表列出了PowerShell中可用的所有正则表达式元字符语法-
| Subexpression | Matches |
|---|---|
| ^ | Matches the beginning of the line. |
| $ | Matches the end of the line. |
| . | Matches any single character except newline. Using m option allows it to match the newline as well. |
| […] | Matches any single character in brackets. |
| [^…] | Matches any single character not in brackets. |
| \A | Beginning of the entire string. |
| \z | End of the entire string. |
| \Z | End of the entire string except allowable final line terminator. |
| re* | Matches 0 or more occurrences of the preceding expression. |
| re+ | Matches 1 or more of the previous thing. |
| re? | Matches 0 or 1 occurrence of the preceding expression. |
| re{ n} | Matches exactly n number of occurrences of the preceding expression. |
| re{ n,} | Matches n or more occurrences of the preceding expression. |
| re{ n, m} | Matches at least n and at most m occurrences of the preceding expression. |
| a| b | Matches either a or b. |
| (re) | Groups regular expressions and remembers the matched text. |
| (?: re) | Groups regular expressions without remembering the matched text. |
| (?> re) | Matches the independent pattern without backtracking. |
| \w | Matches the word characters. |
| \W | Matches the nonword characters. |
| \s | Matches the whitespace. Equivalent to [\t\n\r\f]. |
| \S | Matches the nonwhitespace. |
| \d | Matches the digits. Equivalent to [0-9]. |
| \D | Matches the nondigits. |
| \A | Matches the beginning of the string. |
| \Z | Matches the end of the string. If a newline exists, it matches just before newline. |
| \z | Matches the end of the string. |
| \G | Matches the point where the last match finished. |
| \n | Back-reference to capture group number “n”. |
| \b | Matches the word boundaries when outside the brackets. Matches the backspace (0x08) when inside the brackets. |
| \B | Matches the nonword boundaries. |
| \n, \t, etc. | Matches newlines, carriage returns, tabs, etc. |
| \Q | Escape (quote) all characters up to \E. |
| \E | Ends quoting begun with \Q. |
这是一个完整的示例，展示了如何在PowerShell中使用正则表达式。
| Sr.No. | Match & Description |
|---|---|
| 1 | Match Characters
Example of supported regular expression characters. |
| 2 | Match Character Classes
Example of supported character classes. |
| 3 | Match Quantifiers
Example of supported quantifiers. |