![]() ![]() (Note: keep in mind that digits are word characters.) \b does not itself match any character but "anchors" the pattern to a word boundary. Matches foo as a complete word that is, foo must be bounded on both ends by a non-word character or by a start or end of line Matches an a at the end of a line a "$" does not match any characters itself but "anchors" the Matches an a at the beginning of a line a "^" does not match any characters itself but "anchors" the \W = any non-word character, \s = any whitespace character, \S any non-whitespace character Matches a single "word" character this is an abbreviation for other abbreviations include: Matches a string enclosed in double quotes, including the quotation marks, where the quoted string cannotĬontain any embedded double quotes the pattern ".*" would match strings with nested quotation marks, such as: Instead, they are part of the syntax that is used for Meta-characters are not part of the strings that are matched byĪ pattern. These are called meta-characters or meta-symbols. However, most of the basics are supported by most implementations.Ĭertain characters have special purposes in regular expressions. Unfortunately, the syntax is not standardized ![]() Many textĮditors and most programming languages have some built-in support for Regular expressions are important tools for text processing. Regular expressions are patterns that can be matched against strings. ![]()
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