javascript - 什么是匹配URL的良好正则表达式？ [重复](What is a good regular expression to match a URL? [duplicate])

Question

This question already has an answer here:(这个问题已经在这里有了答案：)

• What is the best regular expression to check if a string is a valid URL?(检查字符串是否为有效URL的最佳正则表达式是什么？) 52 answers(52个答案)

Currently I have an input box which will detect the URL and parse the data.(目前，我有一个输入框，它将检测URL并解析数据。)

So right now, I am using:(所以现在，我正在使用：)

var urlR = /^(?:([A-Za-z]+):)?(/{0,3})([0-9.-A-Za-z]+)
           (?::(d+))?(?:/([^?#]*))?(?:?([^#]*))?(?:#(.*))?$/;
var url= content.match(urlR);

The problem is, when I enter a URL like www.google.com , its not working.(问题是，当我输入www.google.com类的URL时，它不起作用。)

when I entered http://www.google.com , it is working.(当我输入http://www.google.com ，它正在工作。)

I am not very fluent in regular expressions.(我不太会使用正则表达式。)

Can anyone help me?(谁能帮我？)   ask by bigbob translate from so

Answer 1

Regex if you want to ensure URL starts with HTTP/HTTPS:(正则表达式是否要确保URL以HTTP / HTTPS开头：)

https?://(www.)?[-a-zA-Z0-9@:%._+~#=]{1,256}.[a-zA-Z0-9()]{1,6}([-a-zA-Z0-9()@:%_+.~#?&//=]*)

If you do not require HTTP protocol:(如果您不需要HTTP协议：)

[-a-zA-Z0-9@:%._+~#=]{1,256}.[a-zA-Z0-9()]{1,6}([-a-zA-Z0-9()@:%_+.~#?&//=]*)

To try this out see http://regexr.com?37i6s , or for a version which is less restrictive http://regexr.com/3e6m0 .(要尝试此操作，请访问http://regexr.com?37i6s ，或使用限制性较弱的http://regexr.com/3e6m0版本。)

Example JavaScript implementation:(JavaScript实现示例：)

 var expression = /[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)?/gi; var regex = new RegExp(expression); var t = 'www.google.com'; if (t.match(regex)) { alert("Successful match"); } else { alert("No match"); }