A. Regular Expressions
A regular expression defines a set of one or more strings of characters. A simple string of characters is a regular expression that defines one string of characters: itself. A more complex regular expression uses letters, numbers, and special characters to define many different strings of characters. A regular expression is said to match any string it defines.
This appendix describes the regular expressions used by ed, vim, emacs, grep, mawk/gawk, sed, Perl, and many other utilities. Refer to page 1090 for more information on Perl ...
Get A Practical Guide to Fedora™ and Red Hat® Enterprise Linux® now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
