The following JavaScript code returns false if the string contains only numbers or characters other than [a-zA-Z0-9_].
如果字符串只包含[a-zA-Z0-9_]之外的数字或字符，则以下JavaScript代码返回false。
function validate(n) {
return (!/^[\d]+$/.test(n) && /^[\w]+$/.test(n));
}
Is it possible to do this with just a regexp? I want to take advantage of pattern attributes on the input tag for validation.
仅仅使用regexp是否可能实现这一点?我想利用输入标签上的模式属性进行验证。
<input type="text" pattern="...">
Edit: I also want it to be between 5 and 20 characters
编辑:我还希望它在5到20个字符之间
1 个解决方案
#1
3
Like this: ^[a-zA-Z0-9_]*[a-zA-Z_]+[a-zA-Z0-9_]*$
[:^ - za - z0 - 9 _]*[a-zA-Z_]+[a-zA-Z0-9_]* $
This regex matches zero or more characters including numbers, at least one character that isn't a number, followed by another zero or more characters including numbers.
这个regex匹配0或多个字符，包括数字，至少一个字符不是数字，后面是另一个0或更多字符，包括数字。
#1
3
Like this: ^[a-zA-Z0-9_]*[a-zA-Z_]+[a-zA-Z0-9_]*$
[:^ - za - z0 - 9 _]*[a-zA-Z_]+[a-zA-Z0-9_]* $
This regex matches zero or more characters including numbers, at least one character that isn't a number, followed by another zero or more characters including numbers.
这个regex匹配0或多个字符，包括数字，至少一个字符不是数字，后面是另一个0或更多字符，包括数字。