c# - 帮助正则表达式模式

Question

我有一个 txt 文件，每一行都有一组随机字符串，我只需要选择只包含字符的行:1234567890qwertyuiopasdfghjklzxcvbnm-._~

我正在逐行阅读并逐个字符验证，我认为这不是最好的方法，而且我认为 RegEx 是完美的。

那么有人可以为此提供模式帮助吗？

谢谢!

Answer 1

 /^[-0-9a-z._~]*$/

 ^       :: matches the start of a string/start of a line
 [       :: start of a character class, means match any one of the contained characters
 -       :: dash has a special meaning in character classes, so to avoid having it interpreted for its special meaning, list it first
 0-9     :: shorthand for 0123456789 in a character class
 a-z     :: shorthand for abcdefghijklmnopqrstuvwxyz in a character class
 ._~     :: means exactly these characters in a character class
 ]       :: end of the character class 
 *       :: match zero or more of the previous atom (in this case, the character class)
 $       :: matches the end of a string/end of a line