If so, a comma "replaces" the zero width assertion.

如果是这样，逗号将“替换”零宽度断言。

youdao

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。

youdao