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The UNIX OS has several commands that use regular expressions.
-- editors (vi, emacs) -- grep and cousins -- lexUnix commands deal with single lines of text. The Unix regular expressions notation includes special symbols that denote the beginning and end of a line.
^ beginning of of a line $ ending of of a line
The character ``.'' in Unix regular expressions stands for any character.
A quick overview of Unix regular expressions
Reg-expr Description ---------------------------------------------------------------------- . the wild card symbol matches any character except newline [a-z0-9] Matches any single character of the set [^a-z0-9] Matches any single character not in set x? Matches 0 or 1 x's, where x is any of the above x* Matches 0 or more x's cia|mi5 Matches one of cia or mi5 (x) Brackets a regular expression
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Last modified: 27/July/98 (12:14)