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What regular expressions are supported?

April 26, 2017expressions regular supported

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What regular expressions are supported?

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Both Basic Regular Expressions (BREs) and Extended Regular Expressions (EREs) are supported and are described in XBD, Chapter 9, Regular Expressions and all of the utilities and interfaces that use regular expressions refer back to this definition. Basic regular expressions: csplit, ctags, ed, ex, expr, grep, more, nl, pax, pg, sed, vi Extended regular expressions: awk, egrep, grep -E, lex The functions regcomp() and regexec() in XSH, Chapter 3, System Interfaces implement regular expressions as defined in the Single UNIX Specification.