(sed.info)sed regular expressions

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Enter node , (file) or (file)node

5 Regular Expressions: selecting text
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Regular Expressions Overview

Overview of Regular expression in 'sed'

BRE vs ERE

Basic (BRE) and extended (ERE) regular expression

syntax

BRE syntax

Overview of basic regular expression syntax

ERE syntax

Overview of extended regular expression syntax

Character Classes and Bracket Expressions

regexp extensions

Additional regular expression commands

Back-references and Subexpressions

Back-references and Subexpressions

Escapes

Specifying special characters

Locale Considerations

Multibyte characters and locale considrations