preg expression regular expression details and introduction Useful regex examples Reference: http://www.catswhocode.com/blog/15-php-regular-expressions-for-web-developers REGULAR EXPRESSIONS SYNTAX Regular Expression Will match… foo The string “foo” ^foo “foo” at the start of a string foo$ “foo” at the end of a string ^foo$ “foo” when it is alone on a string [abc] a, b, or c [a-z] Any lowercase letter [^A-Z] Any character that is not a uppercase letter (gif|jpg) Matches either “gif” or “jpg” [a-z]+ One or more lowercase letters [0-9.-] Ðny number, dot, or minus sign ^[a-zA-Z0-9_]{1,}$ Any word of at least one letter, number or _ ([wx])([yz]) wy, wz, xy, or xz [^A-Za-z0-9] Any symbol (not a number or a letter) ([A-Z]{3}|[0-9]{4}) Matches three letters or four numbers PHP REGULAR EXPRESSION FUNCTIONS Function Description preg_match() The preg_match() function searches string for pattern, returning true if pattern exists, and false otherwise. preg_match_
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