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I've seen a lot of commonality in regex capabilities of different regex-enabled tools/languages (e.g. perl, sed, java, vim, etc), but I've also many differences.
Is there a standard subset of regex capabilities that all regex-enabled tools/languages will support? How do regex capabilities vary between tools/languages?
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Regex is not a programming language-specific application; in fact, it can be used in all programming languages today. Programming languages give support to the usage of Reges, but all the magic and strength comes from the Regex itself.
A Regular Expression is used for identifying a search pattern in a text string. It also helps in finding out the correctness of the data and even operations such as finding, replacing and formatting the data is possible using Regular Expressions.
There are also two types of regular expressions: the "Basic" regular expression, and the "extended" regular expression.
Special Regex Characters: These characters have special meaning in regex (to be discussed below): . , + , * , ? , ^ , $ , ( , ) , [ , ] , { , } , | , \ . Escape Sequences (\char): To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ).
Compare Regular Expression Flavors
http://www.regular-expressions.info/refflavors.html
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