It matches any character from uppercase A through uppercase Z. It matches any character from lower-case a through lowercase z. It matches any decimal digit from 0 through 9. They are used to find a range of characters. Bracketsīrackets () have a special meaning when used in the context of regular expressions. After that we will introduce you with regular expression related functions. Lets give explanation for few concepts being used in POSIX regular expression. The simplest regular expression is one that matches a single character, such as g, inside strings such as g, haggle, or bag. The structure of a POSIX regular expression is not dissimilar to that of a typical arithmetic expression: various elements (operators) are combined to form more complex expressions. You can use any of them based on your comfort. PHP offers functions specific to two sets of regular expression functions, each corresponding to a certain type of regular expression. Using regular expression you can search a particular string inside a another string, you can replace one string by another string and you can split a string into many chunks. They provide the foundation for pattern-matching functionality. Regular expressions are nothing more than a sequence or pattern of characters itself.
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