Javascript 检查字符串是否与 JS 中的正则表达式匹配
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Check whether a string matches a regex in JS
提问by Richard
I want to use JavaScript (can be with jQuery) to do some client-side validation to check whether a string matches the regex:
我想使用 JavaScript(可以使用 jQuery)来做一些客户端验证来检查字符串是否与正则表达式匹配:
^([a-z0-9]{5,})$
Ideally it would be an expression that returned true or false.
理想情况下,它将是一个返回 true 或 false 的表达式。
I'm a JavaScript newbie, does match()
do what I need? It seems to check whether part of a string matches a regex, not the whole thing.
我是 JavaScript 新手,可以满足match()
我的需求吗?它似乎检查字符串的一部分是否与正则表达式匹配,而不是整个事情。
回答by user113716
Use regex.test()
if all you want is a boolean result:
使用regex.test()
,如果你想要的是一个布尔结果:
console.log(/^([a-z0-9]{5,})$/.test('abc1')); // false
console.log(/^([a-z0-9]{5,})$/.test('abc12')); // true
console.log(/^([a-z0-9]{5,})$/.test('abc123')); // true
...and you could remove the ()
from your regexp since you've no need for a capture.
...并且您可以()
从正则表达式中删除 ,因为您不需要捕获。
回答by Abhijeet Kasurde
Use test()
method :
使用test()
方法:
var term = "sample1";
var re = new RegExp("^([a-z0-9]{5,})$");
if (re.test(term)) {
console.log("Valid");
} else {
console.log("Invalid");
}
回答by pmrotule
You can use match()
as well:
您也可以使用match()
:
if (str.match(/^([a-z0-9]{5,})$/)) {
alert("match!");
}
But test()
seems to be faster as you can read here.
但test()
似乎更快,因为您可以在这里阅读。
Important difference between match()
and test()
:
match()
和之间的重要区别test()
:
match()
works only with strings, but test()
works also with integers.
match()
仅适用于字符串,但test()
也适用于整数。
12345.match(/^([a-z0-9]{5,})$/); // ERROR
/^([a-z0-9]{5,})$/.test(12345); // true
/^([a-z0-9]{5,})$/.test(null); // false
// Better watch out for undefined values
/^([a-z0-9]{5,})$/.test(undefined); // true
回答by user278064
Use /youregexp/.test(yourString)
if you only want to know whether your string matches the regexp.
使用/youregexp/.test(yourString)
,如果你只是想知道你的字符串是否与正则表达式匹配。
回答by user2449231
Here's an example that looks for certain HTML tags so it's clear that /someregex/.test()
returns a boolean:
这是一个查找某些 HTML 标签的示例,因此很明显/someregex/.test()
返回一个布尔值:
if(/(span|h[0-6]|li|a)/i.test("h3")) alert('true');
回答by Eysun
let str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
let regexp = /[a-d]/gi;
console.log(str.match(regexp));
回答by Tongi
You can try this, it works for me.
你可以试试这个,它对我有用。
<input type="text" onchange="CheckValidAmount(this.value)" name="amount" required>
<script type="text/javascript">
function CheckValidAmount(amount) {
var a = /^(?:\d{1,3}(?:,\d{3})*|\d+)(?:\.\d+)?$/;
if(amount.match(a)){
alert("matches");
}else{
alert("does not match");
}
}
</script>
回答by Jaber Alshami
please try this flower:
请试试这朵花:
/^[a-z0-9\_\.\-]{2,20}\@[a-z0-9\_\-]{2,20}\.[a-z]{2,9}$/.test('[email protected]');
true
真的
回答by Kamil Kie?czewski
try
尝试
/^[a-z\d]{5,}$/.test(str)
console.log( /^[a-z\d]{5,}$/.test("abc123") );
console.log( /^[a-z\d]{5,}$/.test("ab12") );
回答by Juan Navarrete
I would recommend using the execute method which returns null if no match exists otherwise it returns a helpful object.
我建议使用 execute 方法,如果不存在匹配项,则该方法返回 null,否则返回一个有用的对象。
let case1 = /^([a-z0-9]{5,})$/.exec("abc1");
console.log(case1); //null
let case2 = /^([a-z0-9]{5,})$/.exec("pass3434");
console.log(case2); // ['pass3434', 'pass3434', index:0, input:'pass3434', groups: undefined]