javascript - 需要有关 Javascript 正则表达式的帮助

Question

该框应允许:

• 大小写字母(不区分大小写)
• 数字 0 到 9
• Angular 色，! # $ % & ' * + -/= ? ^ _ ` { | } ~
• 字符“.”前提是它不是第一个或最后一个字符

Answer 1

尝试

^(?!\.)(?!.*\.$)[\w.!#$%&'*+\/=?^`{|}~-]*$

说明:

^         # Anchor the match at the start of the string
(?!\.)    # Assert that the first characters isn't a dot
(?!.*\.$) # Assert that the last characters isn't a dot
[\w.!#$%&'*+\/=?^`{|}~-]*   # Match any number of allowed characters
$         # Anchor the match at the end of the string