What is Regular Expressions, an Introduction to Regular Expressions
Regular expressions(or regex) are a language used for more sophisticated form and text processing. They are often used to perform complex search-and-replace operations, and to validate that text data is well-formed. Regular expressions can be used to perform all sorts of powerful text processing and manipulation in just about every language and on every platform. Every regular expression either matches text (search) or matches and replaces text (search and replace).
Today, regular expressions are supported by most programming languages, as well as many scripting languages (like Perl, ASP, Visual Basic, .NET, C#, Java, JSP, PHP,Python, ColdFusion, Tcl, Ruby and many other languages), editors (EmEditor, TextPad), applications (Microsoft Word, Microsoft Excel, StarOffice, OpenOffice), databases(MySQL, SQL Server), and command-line tools.
regular expressions can be difficult to read but the truth is that regular expressions are nowhere near as complex as they appear to be at first glance. All it takes is a clear understanding of the problem being solved and how to leverage regular expressions so as to solve them.
Regular expressions implementations are the same on different languages but there may be differences between syntax and features. Regular expressions provides multiple solutions to any problem. They may be simpler or complex and may wary from developer to developer.
What is Regular Expressions?
A regular expression is a string containing a combination of normal characters and special metacharacters or metasequences which is know as “regex Pattern” regex Pattern represent an idea to search-or-replace a desire characters, words, strings, sentence or string pattern. Pattern search is done through the regular expression engine.
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