alphanumeric

I am working on validating my commenting script, and I need to strip down all non-alphanumeric chars except those used in Western Europe. My plan is to regex out all non-alphanumeric characters with: preg_replace("/[^A-Za-z0-9 ]/", '', $string); But that so far strips out all European characters and a £ sign, so "Café Rouge" becomes "Caf Rouge". How can I add an array of Euro chars to the above regex. The array is: £, €, á, à, â, ä, æ, ã, å, è, é, ê, ë, î, ï, í, ì, ô, ö, ò, ó, ø, õ, û, ü, ù, ú, ÿ, ñ, ß I use UTF-8 SOLUTION: $comment = preg_replace('/[^\p{Latin}\d\s\p{P}]/u', '', $comment); and

is there any C# method that works similar to Convert.ToBase64String but doesn't generate anything except alphanumeric output? Thanks! Xiaofu You're probably looking at using something like Base32 encoding then. There is a Base32 encoder/decoder for C# here by Michael Giagnocavo. It uses a combination of capitalized letters and numbers. There's also a related discussion on StackOverflow here . EDIT: And if by any chance this is for URL-safe related Base64 encoding, just do Base64 and replace "+" with "-" and "/" with "_". But I'm guessing, you may not want it for that. The answers are a bit

In Swift, how can I check if a String is alphanumeric, ie, if it contains only one or more alphanumeric characters [a-zA-Z0-9] , excluding letters with diacritics, eg, é. extension String { var isAlphanumeric: Bool { return !isEmpty && range(of: "[^a-zA-Z0-9]", options: .regularExpression) == nil } } "".isAlphanumeric // false "abc".isAlphanumeric // true "123".isAlphanumeric // true "ABC123".isAlphanumeric // true "iOS 9".isAlphanumeric // false A modern Swift 3 and 4 solution extension String { func isAlphanumeric() -> Bool { return self.rangeOfCharacter(from: CharacterSet.alphanumerics

I'm using the following perl code to generate random alphanumeric strings (uppercase letters and numbers, only) to use as unique identifiers for records in my MySQL database. The database is likely to stay under 1,000,000 rows, but the absolute realistic maximum would be around 3,000,000. Do I have a dangerous chance of 2 records having the same random code, or is it likely to happen an insignificantly small number of times? I know very little about probability (if that isn't already abundantly clear from the nature of this question) and would love someone's input. perl -le 'print map { ("A"..