Regular expression | regular expression wiki
Aregularexpression(abbreviatedregexporregex)isawaytodescribesetsofcharactersusingsyntacticrules.[1]Manyprogramminglanguagesuseorsupportregularexpressions.Aregularexpressionisthenusedbyaspecialprogramorpartofaprogramminglanguage.Thisprogramwilleithergenerateaparserthatcanbeusedtomatchexpressionsoritwillmatchsuchexpressionsitself.A regularexpressionprocessor isusedforprocessingaregularexpressionstatementintermsofagrammarinagiven formallanguage,andwiththatexaminesatextstring.Afewexamplesofwhatc...
A regular expression (abbreviated regexp or regex) is a way to describe sets of characters using syntactic rules.[1] Many programming languages use or support regular expressions. A regular expression is then used by a special program or part of a programming language. This program will either generate a parser that can be used to match expressions or it will match such expressions itself.
A regular expression processor is used for processing a regular expression statement in terms of a grammar in a given formal language, and with that examines a text string.
A few examples of what can be matched with regular expressions:
The sequence of characters "car" appearing consecutively in any context, such as in "car", "cartoon", or "bicarbonate" The sequence of characters "car" occurring in that order with other characters between them, such as in "Icelander" or "chandler" The word "car" when it appears as an isolated word The word "car" when preceded by the word "blue...