Regular expressions are nothing more than a sequence or pattern of characters itself. They provide the foundation for pattern-matching functionality.
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.
PHP offers functions specific to two sets of regular expression functions, each corresponding to a certain type of regular expression. You can use any of them based on your comfort.
POSIX Regular Expressions
PERL Style Regular Expressions
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