Appendix A. Regular Expressions


A. Regular Expressions

IN THIS APPENDIX

Characters

898

Delimiters

898

Simple Strings

898

Special Characters

898

Rules

901

Bracketing Expressions

902

The Replacement String

902

Extended Regular Expressions

903


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, awk, sed, and other utilities. The regular expressions used in shell ambiguous file references are different and are described in "Filename Generation/Pathname Expansion" on page 133.




A Practical Guide to UNIX[r] for Mac OS[r] X Users
A Practical Guide to UNIX for Mac OS X Users
ISBN: 0131863339
EAN: 2147483647
Year: 2005
Pages: 234

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