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Classification of regular expressions
Basic Regular Expressions (basic Regular expression also known as basic RegEx abbreviation Bres)
Extended Regular expression (Extended Regular expression also known as Extended RegEx abbreviation Eres)
Perl Regular Expressions (Perl Regular expression called Perl RegEx abbreviation pres)
Basic components
The basic component of a regular expression.
POSIX character class
The POSIX character class is a special meta-sequence (meta sequence) of a shape such as [: ...:] that can be used to match a specific range of characters.
Metacharacters
Metacharacters (meta character) is a Perl-style regular expression that is supported by only a subset of text processing tools, not all text processing tools.
Linux Regular Expression outline