[英]HTML5 Regex Pattern Validation
The validation I need is the following AZ, az, 0-9
, no trailing/leading whitespace, -._
only once non-trailing/leading 我需要的验证是以下
AZ, az, 0-9
,无结尾/前导空格, -._
仅一次非结尾/前导
Till now I have the following: 到现在为止,我有以下内容:
<input type="text" pattern="^\S[a-zA-Z0-9]*\S$">
This takes care of the leading trailing whitespace and AZ,az,0-9, but it needs minimum 2 characters 这会照顾到前导尾随空格和AZ,az,0-9,但至少需要2个字符
Then I thought of something like this for the symbols -._
然后我想到了这样的符号
-._
<input type="text" pattern="^\S[a-zA-Z0-9]*[\-_+]{,1}\S$">
But no luck there. 但是那里没有运气。 Any ideas?
有任何想法吗?
Since pattern
attribute uses the same syntax as JavaScript, you can use the following regex: 由于
pattern
属性使用与JavaScript相同的语法,因此可以使用以下正则表达式:
<input type="text" pattern="^(?=..)[a-zA-Z0-9]*([_.-][a-zA-Z0-9]*)?$">
You can test with the snippet above by typing something in, then change focus from the input. 您可以通过输入一些内容来测试上面的代码段,然后从输入中更改焦点。
The input can only contain a-zA-Z0-9
and at most once of _.-
. 输入只能包含
a-zA-Z0-9
和最多一次的_.-
。 The look-ahead in front (?=..)
checks that there are at least 2 characters. 前面的前瞻
(?=..)
检查是否至少有2个字符。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.