| 1. | The mask contains one or more non - printable characters
掩码包含一个或多个不可打印字符。 |
| 2. | Invalid masks include masks containing non - printable characters
无效掩码包括含不可打印字符的掩码。 |
| 3. | Escapes unprintable characters in a
中的不可打印字符。 |
| 4. | Non - printing characters may also be part of a regular expression
非打印字符也可以是正则表达式的组成部分。 |
| 5. | Non - printable characters
>不可打印字符 |
| 6. | The following table lists the escape sequences that represent non - printing characters
下表列出了表示非打印字符的转义序列： |
| 7. | It includes non - printing characters such as spaces , tab characters , and paragraph marks
它包含非打印字符，例如空格、制表符和段落标记。 |
| 8. | Printable characters include letters , digits , punctuation , symbols and the space character
可打印字符包括字母、数字、标点、符号和空白字符。 |
| 9. | The period matches all but one single printing or non - printing character in a string
句点( . )匹配字符串中的各种打印或非打印字符，只有一个字符例外。 |
| 10. | Lists the escape sequences that are used to represent non - printing characters in a regular expression
列出用于表示正则表达式中非打印字符的转义序列。 |
