javascript - 正则表达式的解释

Question

谁能解释这个正则表达式的含义？

/^(https?):\/\/(www\.)?[a-zA-Z0-9\-\.]+\.[a-zA-Z0-9]{2,3}[a-zA-Z0-9\-\#\.\/\?]*$/

Answer 1

最后我建立了我的解决方案：

function validateURL(url) 
{
  var re = /^(https?):\/\/(www\.)?[a-z0-9\-\.]+\.[[a-z0-9\-\.\/]{2,}]*$/;
    if (!re.test(url))
    { 
        return false;
    }
    else
    {
        return true;
    }
}

this function return true if your url contain these:
part 1. https or http
part 2. www or not (means optional).
Below image exploring in more depth.

我错了？

Answer 2

我已经尝试了以下方法，对我来说效果很好。

var url = "https://www.xyz.xe";
function validateURL(url) 
{
  var urlregex = new RegExp("^(http|https)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&%\$\-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(\:[0-9]+)*(/($|[a-zA-Z0-9\.\,\?\'\\\+&%\$#\=~_\-]+))*$");
  return urlregex.test(url);
}
validateURL(url);

返回 false whenurl="https://www.xyz.x"和 true whenurl="https://www.xyz.xe"