---

18.7 Regular expression syntaxes ¶

Gnulib supports many different types of regular expressions; although the underlying features are the same or identical, the syntax used varies. The descriptions given here for the different types are generated automatically.

• ‘awk’ regular expression syntax
• ‘egrep’ regular expression syntax
• ‘ed’ regular expression syntax
• ‘emacs’ regular expression syntax
• ‘gnu-awk’ regular expression syntax
• ‘grep’ regular expression syntax
• ‘posix-awk’ regular expression syntax
• ‘posix-basic’ regular expression syntax
• ‘posix-egrep’ regular expression syntax
• ‘posix-extended’ regular expression syntax
• ‘posix-minimal-basic’ regular expression syntax
• ‘sed’ regular expression syntax