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I'm trying to find a regex that matches if a Tweet it's a true mention. To be a mention, the string can't start with "@" and can't contain "RT" (case insensitive) and "@" must start the word. In the examples I commented the desired output Some examples: function search($strings, $regexp) { $regexp; foreach ($strings as $string) { echo "Sentence: \"$string\" <- " . (preg_match($regexp, $string) ? "MATCH" : "NO MATCH") . "\n"; } } $strings = array( "Hi @peter, I like your car ", // <- MATCH "@peter I don't think so!", //<- NO MATCH: the string it's starting with @ it's a reply "Helo!! :@ how are you!", // NO MATCH <- it's not a word, we need @(word) "Yes @peter i'll eat them this evening! RT @peter: hey @you, do you want your pancakes?", // <- NO MATCH "RT/rt" on the string , it's a RT "Helo!! ineed@aser.com how are you!", //<- NO MATCH, it doesn't start with @ "@peter is the best friend you could imagine. RT @juliet: @you do you know if @peter it's awesome?" // <- NO MATCH starting with @ it's a reply and RT ); echo "Example 1:\n"; search($strings, "/(?:[[:space:]]|^)@/i"); Current output: Example 1: Sentence: "Hi @peter, I like your car " <- MATCH Sentence: "@peter I don't think so!" <- MATCH Sentence: "Helo!! :@ how are you!" <- NO MATCH Sentence: "Yes @peter i'll eat them this evening! RT @peter: hey @you, do you want your pancakes?" <- MATCH Sentence: "Helo!! ineed@aser.com how are you!" <- MATCH Sentence: "@peter is the best friend you could imagine. RT @juliet: @you do you know if @peter it's awesome?" <- MATCH EDIT: I need it in regex beacause it can be used on MySQL and anothers languages too. Im am not looking for any username. I only want to know if the string it's a mention or not.

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