javascript method to check a valid URL
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What is the best regular expression to check if a string is a valid URL?
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What is the best way to check if a URL exists in PHP?
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How to check if string contents have any HTML in it?
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How do you validate that a string is a valid MAC address in C?
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How do I check if a given string is a legal/valid file name under Windows?
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jQuery Validation plugin: how to check if an element is valid?
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PHP validation/regex for URL
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How do I check if file exists in jQuery or pure JavaScript?
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Adding a parameter to the URL with JavaScript
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How to check if an email address is real or valid using PHP
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What is the best way to test for an empty string with jquery-out-of-the-box?
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How to extract the hostname portion of a URL in JavaScript
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Regex to match URL end-of-line or "/" character
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python: check if url to jpg exists
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Client-side detection of HTTP request method
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How to tell if a string contains valid Python code
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How can you check for a #hash in a URL using JavaScript?