同时包含不超过3个字母的正则表达式不应接受1a1a1a1a1 [英] regular expression with no more than 3 alphabets concurrently should not accept 1a1a1a1a1

问题描述

不应该接受:1a1a1a1a1，aaaa11111，2222aaa33a 任何地方只能允许3个字符，不应该超过3个字符 我尝试如下，但失败了

should not accept: 1a1a1a1a1, aaaa11111 ,2222aaa33a only allow 3 characters anywhere no more than three should not allowed I tried like below but failed

var patt = new RegExp("([A-Za-z]){4}");
var result = patt.test(DLnumber);
if (result == true) {
    alert("No more than three alphabets are allowed");
    return false;
}

推荐答案

我认为这可能是您想要的:

I thin this may be what you look for:

if (str.replace(/[^a-z]/gi, "").length>3) {
    alert("No more than three alphabets are allowed");
    return false;
}

它计算字符串中按字母顺序排列的字符...

It counts the Alphabetical chars in the string...

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