Some utilities, instead, support the Extended Regular Expressions (ERE)ĭescribed in Extended Regular Expressions any exceptions for both cases are noted in the descriptions of The Basic Regular Expression (BRE) notation and construction rules in Basic Regular Expressions shallĪpply to most utilities supporting regular expressions. Interpreted differently depending on the current locale, many features, such as character class expressions, provide for contextual ![]() Orderings, where these character sets are interpreted according to the current locale. Regular expressions are a context-independent syntax that can represent a wide variety of character sets and character set Regular Expressions (REs) provide a mechanism to select specific strings from a set of character strings. ![]() The Open Group Base Specifications Isedition
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