url validation RegExp recognize email address as url

Question

I have to recognize url in some text. I use the following code ( this.value is the text):

if (new RegExp("([a-zA-Z0-9]+://)?([a-zA-Z0-9_]+:[a-zA-Z0-9_]+@)?([a-zA-Z0-9.-]+\\.[A-Za-z]{2,4})(:[0-9]+)?(/.*)?").test(this.value)) {
    alert("url inside");
}

The problem that is recognize also email address as url. How can I prevent it?

Answer 1

The expression /[a-zA-Z0-9_]/ is the same as /\\w/i .

The original RegExp matches the "domain.org" substring in a text like "text name@domain.org text mailto:name@domain-2.org text". To fix this add (?:^|[^@\\.\\w-]) at the beginning of the RegExp - a substring should be at the beginning of a line or should not begin with characters '@', '.', '-', '\\w'.

To exclude "mailto:user@..." substrings the expression ([a-zA-Z0-9_]+:[a-zA-Z0-9_]+@)? should be modified. Because Javascript RegExp has no look-behind expressions the only way to exclude "mailto" is to use the look-ahead expression \\w(?!ailto:)\\w+: , but all substrings like "[a-zA-Z0-9_]ailto:...@..." will be excluded also.

To exclude from matches the substring "user.name" from a text like "text user.name@domain.org text" add the expression (?=$|[^@\\.\\w-]) at the ending of the RegExp - match a substring only if the end of line follows the substring or the following characters '@', '.', '-', '\\w' don't follow the substring.

 var re = /(?:^|[^@\\.\\w-])([a-z0-9]+:\\/\\/)?(\\w(?!ailto:)\\w+:\\w+@)?([\\w.-]+\\.[az]{2,4})(:[0-9]+)?(\\/.*)?(?=$|[^@\\.\\w-])/im; //if (re.test(this.value)) { // alert("url inside"); //} var s1 = "text name@domain.org name.lastname@domain-2.org text mailto:user.name@domain-3.org text"; if (re.test(s1)) { alert("Failed: text without URL"); } var s2 = "text http://domain.org/ text"; if (!re.test(s2)) { alert("Failed: text with URL"); } alert("OK");