Validating url

On this page we will show a few examples of how to validate e-mails, website addresses (URLs) and some other special cases of input data.» Validate e-mail address There is no way to be 100% sure an e-mail address is actually working unless you send an e-mail there.

I wanted to know if there is any standard APIs in Java to validate a given URL?

I want to check both if the URL string is right i.e.

sourceid=chrome-instant&ion=1&espv=2&es_th=1&ie=UTF-8#newwindow=1&q=check if valid url c# true: https://stackoverflow.com/questions/ask im using c#, how to enhance this checking url validation to be more accurate? Try Create', it doesn't helped me, because it return the result as true even though it obviously not a valid url.

Your Check URLValid is returning exactly what you have told it to. sourceid=chrome-instant&ion=1&espv=2&es_th=1&ie=UTF-8#newwindow=1&q=check if valid url c# This is an http S (Secure) url and your method says The main problem is that most strings are valid relative URL's so I would avoid using Uri Kind. Most web browsers silently add HTTP:// to the string to make it a valid url.

Assume that this regex will be used for a public URL shortener written in PHP, so URLs like shouldn’t pass (even though they’re technically valid).

Also, in this case I only want to allow the HTTP, HTTPS and FTP protocols. :ac|ad|aero|ae|af|ag|ai|al|am|an|ao|aq|arpa|ar|asia|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|biz|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|cat|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|coop|com|co|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|info|int|in|io|iq|ir|is|it|je|jm|jobs|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mil|mk|ml|mm|mn|mobi|mo|mp|mq|mr|ms|mt|museum|mu|mv|mw|mx|my|mz|name|na|nc|net|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pro|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tel|tf|tg|th|tj|tk|tl|tm|tn|to|tp|travel|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|xn--0zwm56d|xn--11b5bs3a9aj6g|xn--80akhbyknj4f|xn--9t4b11yi5a|xn--deba0ad|xn--g6w251d|xn--hgbk6aj7f53bba|xn--hlcj6aya9esc7a|xn--jxalpdlp|xn--kgbechtv|xn--zckzah|ye|yt|yu|za|zm|zw)|(?

Because of this one may be tempted to simply copy the best regex you can find (gist).

The problem with this is that while you can copy it now, what happens later when you find a case that is not handled correctly?

What you usually do is check if the e-mail address syntax is valid.

The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.

I also don’t want to allow every possible technically valid URL — quite the opposite.