| 释义 |
- 1
Without the two positional operators, user names of arbitrary length would erroneously be accepted. 如果没有两个位置操作符，则会错误地接受任意长度的用户名。 - 2
So far, you've seen literal, positional, and two kinds of alternation operators. 到目前为止，已经介绍了字面值、位置和两种备选项操作符。 - 3
In the temperature regex, the beginning-of-line and end-of-line operators are two examples of zero-width assertions, or matches that are positional, not literal. 在温度regex中，行开头和行结尾操作符是两个零宽度断言示例，或者匹配位置而非文字。
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