How would one trim all non-alphanumeric and numeric characters from the beginning and end of a string?

如何将一个修剪所有非字母数字字符从字符串的开头和结尾字符和数字的？

youdao

As long as the time part always remains the same throughout, the dates will still be easily comparable and I can just trim it up when I convert it to string for screen display.

只要始终是相同的部分的时候，日期仍将很容易可比，我可以修剪它，当我将其转换为屏幕显示字符串。

youdao

As long as the time part always remains the same throughout, the dates will still be easily comparable and I can just trim it up when I convert it to string for screen display.

只要始终是相同的部分的时候，日期仍将很容易可比，我可以修剪它，当我将其转换为屏幕显示字符串。

youdao