[英]Validation In java script
Currently I'm attempting to create a regular expression to validate an user input field which requires the input to contain at least one of each of the following: 目前我正在尝试创建一个正则表达式来验证用户输入字段,该字段要求输入至少包含以下各项之一:
& @ ! # +
& @ ! # +
& @ ! # +
I attempted to create a regular expression that will validate the input correctly: 我试图创建一个正确的表达式来正确验证输入:
/^([a-zA-Z+]+[0-9+]+[&@!#+]+)$/i.test(userpass);
However, the input is not validated correctly. 但是,输入未正确验证。 How should I go about doing that?
我应该怎么做呢?
尝试这个:
/[a-z]/i.test(userpass) && /[0-9]/.test(userpass) && /[&@!#+]/.test(userpass)
you can simplify the regex with lookahead 你可以用lookahead简化正则表达式
^(?=.*[&@!#+])(?=.*[A-Z])(?=.*\d).+$
------------- --------- -------
| | |->match only if there's a digit ahead
| |->match only if there's a uppercase alphabet ahead
|->match only if there's any 1 of [&@!#+]
[AZ]
would match a single uppercase letter [AZ]
将匹配单个大写字母
\\d
would match a single digit \\d
将匹配一个数字
if(input.search(/\d/)!=-1 && input.search(/[&@!#+]/)!=-1) && input.search(/[A-Z]/)!=-1)
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