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5 Regular Expressions: selecting text

Regular Expressions Overview:    Overview of Regular expression in sed
BRE vs ERE:    Basic (BRE) and extended (ERE) regular expression


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