A regular expression (shortened as regex or regexp; sometimes referred to as rational expression) is a sequence of characters that specifies a search pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation. Regular expression techniques are developed in theoretical computer science and formal language theory.
A regex is a special sequence of characters that defines a pattern for complex string-matching functionality.
While trying to build a parser for KPLC pdf documents, I quickly realised that basic string matching wasnt going to cut it and i had to use Regex and my superficial understanding of it does not help either.
