You can use [: digit:] in place of [0-9], and [: alpha:] is a more portable replacement for [-a-za-z0-9_]. For example, you can strip all punctuation from a string by using the statement.

您可以使用[：digit：]代替[0 - 9]，并且[：alpha：]是比[-a - zA - z0 - 9 _]更具有可移植性的替代者。

youdao

When rounding is required, consider only one digit in the decimal place to the right of the last place in the limit expression.

当修约是必需的，只考虑表达限值中最后一位右边的一位小数。

youdao

When rounding is required, consider only one digit in the decimal place to the right of the last place in the limit expression.

当修约是必需的，只考虑表达限值中最后一位右边的一位小数。

youdao