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1. Introduction to regular expressions

Regular expressions provide powerful, flexible, and efficient ways to process text. The comprehensive pattern matching notation for regular expressions can quickly parse large amounts of text for specific character patterns; extract, edit, replace, or delete text substrings; or add extracted strings to collections to generate reports. Regular expressions are indispensable tools for many applications that work with strings, such as HTML processing, log file parsing, and HTTP header parsing.

The. NET Framework regular expressions incorporate the most common features of other regular expression implementations, are designed to be compatible with Perl 5 regular expressions, include features not yet available in other implementations, and the. NET Framework regular expression classes are part of the base class library and can be used with any language or tool that targets the common language runtime.

2. C#string search

The regular expression language consists of two basic character types: literal (normal) text characters and metacharacters. It is metacharacters that provide processing power for regular expressions. At present, all text editors have some search function, usually you can open a dialog box, in one of the text boxes to type the character string to be located, if you also want to replace the operation, you can type a replacement string, such as Notepad in the Windows operating system, Office series of document editors have this function. This is the easiest way to search, and this type of problem can easily be solved with the String.Replace() method of the String class, but what if you need to identify a duplicate in the document? Writing a routine to select repeated words from a String class is complex, and language is appropriate.

The General Expression Language is a language in which C#string search expressions can be written. In this language, you can combine text to be searched for in a document, escape sequences, and other characters with specific meanings, such as the sequence\b to indicate the beginning and end of a word (child boundaries), or the general expression\bth (i.e., sequence character boundaries are-t-h) if you want to indicate the word you are looking for that begins with the character th. If you want to search for all words ending in th, you can write th\b (sequence t-h-word boundary). However, general expressions are much more complex than this; for example, facilities that store partial text can be found in C#string search operations.

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