preg-match

I'd like to capitalize a string like: ¿"hello"? I want my function to return ¿"Hello"? I've tried with regex and preg_match, with no luck... Here it is my previous question, related with this one: "preg_match is matching two characters when it should only match one" Thank you all! You can do it using preg_replace_callback : preg_replace_callback('/^([^a-z]*)([a-z])/i', function($matches){ return $matches[1] . strtoupper($matches[2]); }, '¿"hello"?'); // ¿"Hello"? Using preg_replace_callback as said ascii-time above, but unicode compatible: echo preg_replace_callback('/^(\PL*)(\pL)/u', function

Alright, so I want the user to be able to enter every character from A-Z and every number from 0-9, but I don't want them entering "special characters". Code: if (preg_match("/^[a-zA-Z0-9]$/", $user_name)) { #Stuff } How is it possible for it to check all of the characters given, and then check if those were matched? I've tried preg_match_all() , but I didn't honestly understand much of it. Like if a user entered "FaiL65Mal", I want it to allow it and move on. But if they enter "Fail{]^7(,", I want it to appear with an error. You just need a quantifier in your regex: Zero or more characters *

When sharing a link in major websites like Digg and Facebook; it will create thumbnails by capturing main images of the page. How they catch images from a webpage? Does it included loading the whole page (e.g. by cURL) and parsing it (e.g. with preg_match) ? To me, this method is slow and unreliable. Does they have a more practical method? P.S. I think there should be a practical method for quick crawling the page by skipping some parts (e.g. CSS and JS) to reach src attributes. Any idea? They typcailly look for an image on the page, and scale it down on their servers. Reddit's scraper code

I have the following regex that I have been using successfully: preg_match_all('/(\d+)\n(\w.*)\n(\d{3}\.\d{3}\.\d{2})\n(\d.*)\n(\d.*)/', $text, $matches) However I have just found that if the text that the (\w.*) part matches starts with a foreign character such as Ä , then it doesn't match anything. Can anyone help me with what the correct pattern should be instead of (\w.*) to match a string that starts with any character? Many thanks If you do want to match umlauts, then add the regex /u modifier, or use \pL in place of \w . That will allow the regex to match letters outside of the ASCII