JavaScript fails to effectively validate URLs

Question

JavaScript fails to effectively validate URLs

I have implemented the following validation for URLs:

jQuery.validator.addMethod("urlValidatorJS", function (value, element) {
    var regExp = (/^HTTP|HTTP|http(s)?:\/\/(www\.)?[A-Za-z0-9]+([\-\.]{1}[A-Za-z0-9]+)*\.[A-Za-z]{2,40}(:[0-9]{1,40})?(\/.*)?$/);
    return this.optional(element) || regExp.test(value);
}, "The URL format is incorrect");

However, I noticed that the validation is allowing invalid URLs such as: http://www.example.com/ %20here.html (URL with space).

Could anyone suggest how to fix this issue in the validation?

javascript validation

Answer 1

Answer №1

(\/.*)?

You mentioned that the final part of the URL may consist of a forward slash followed by multiple instances of any character.

If you wish to exclude spaces, provide more detailed information than simply using ..

Answer 2

(\/.*)?

You mentioned that the final part of the URL may consist of a forward slash followed by multiple instances of any character.

If you wish to exclude spaces, provide more detailed information than simply using ..

Answer 3

Answer №2

Initially, there is a validation module available in jQuery that you could utilize.

Here is the regex to detect the URLs specified (remember the i flag at the end!):

/^(https?:\/\/)(?:[A-Za-z0-9]+([\-\.][A-Za-z0-9]+)*\.)+[A-Za-z]{2,40}(:[1-9][0-9]{0,4})?(\/\S*)?/i

You overlooked the possibility of other addresses like http://some.other.example.com. Additionally, your use of the identifier . was too broad. I substituted it with \S for any non-whitespace character. There were also some unnecessary identifiers such as {1} and the additional HTTP in the initial part of your regex.

You can explore your regex and test it on various strings using websites like regex101. It breaks down each section of your regex for easier debugging.

Answer 4

Initially, there is a validation module available in jQuery that you could utilize.

Here is the regex to detect the URLs specified (remember the i flag at the end!):

/^(https?:\/\/)(?:[A-Za-z0-9]+([\-\.][A-Za-z0-9]+)*\.)+[A-Za-z]{2,40}(:[1-9][0-9]{0,4})?(\/\S*)?/i

You overlooked the possibility of other addresses like http://some.other.example.com. Additionally, your use of the identifier . was too broad. I substituted it with \S for any non-whitespace character. There were also some unnecessary identifiers such as {1} and the additional HTTP in the initial part of your regex.

You can explore your regex and test it on various strings using websites like regex101. It breaks down each section of your regex for easier debugging.

JavaScript fails to effectively validate URLs

Answer №1

Answer №2

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