Regular expression for validating url

regex = /^(http|https):\/\/[a-z0-9] ([\-\.][a-z0-9] )*\.[a-z](([0-9] )? - Valid domain names may contain uppercase ASCII characters. Use multiples of two or four space characters instead.) Plenty of things are wrong with this. )' is equivalent to `(http|https)' and more efficient than the latter. ping the resolved address is returned, even though the request will time out). ;-) (They, among others, are DROPping or filtering ICMP requests, which is considered antisocial.) Ping returns resolved domain names if they can be found (e.g.= ) | | The production | Equality Expression : Equality Expression ! = Relational Expression | is evaluated as follows: | | 1.

If Type(y) is Boolean, return the result of the comparison | x == To Number(y). x_1 can be interpreted as a number (read: is definitely not a URI), continue. Pointed Ears The problem with using a regular expression to check URLs (or any otheraddress such as an e-mail address) is that even if the string fitswithin the range of valid addresses, you don't know if it's actuallyvalid. For example, have you ever tried to ping(1) or one of their subdomains? ___________ If the condition ("x is Na N") does not apply, i.e. ;-) (They, among others, are DROPping or filtering ICMP requests, which is considered antisocial.) What comes to /my/ mind here is of course to use DNS directly, therefore host(1) or nslookup(1) (from the BIND9 host utilities), where the latter is deprecated. regex = /^(http|https):\/\/[a-z0-9] ([\-\.][a-z0-9] )*\.[a-z](([0-9])? - Valid top-level domain names are not restricted to five letters, and the TLD specified in RFC2606 for testing purposes has only four letters. ==' or `==='), you are forcing implicit type conversion on both operands. - Valid top-level domain names must not contain any decimal digit. You are comparing that value against a supposed string value, and since you do not do perform a strict comparison (`!

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= regex.test(field.hpage.value)) return true } The regex should be all right... - The literal dot (`.') does not need not to be escaped in a character class. - Valid domain names may contain more than 5 consecutive decimal digits. Reg Exp.prototype.test() returns a boolean value, either `true' or `false'.

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