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Top Forums Shell Programming and Scripting Multiple conditions in a CASE statement Post 302505830 by Chubler_XL on Thursday 17th of March 2011 07:09:45 PM
Old 03-17-2011
Quote:
Originally Posted by Straitsfan
So when would you glob and when would you use regular expressions? I'm still somewhat confused.Smilie
Most of the time you won't have the option to choose between using glob or regular expressions, and will have to use what the tool offers. As a general rule of thumb you will be using glob for the shell prompt, and regex for everything else.

For example if from a shell prompt you type ls p* you would expect the shell to expand p* to any file begining with p (glob) not any file with zero or more p's anywhere in the name (regex). Which highlights another difference in glob (patterns span the whole string, like having an implied "^" at the front and "$" at the end with regex).

Here is a little table with glob and regex equivalent

globregex
b^b$
b*^b.*$
*.jpg^.*\.jpg$
[ab]*^[ab].*$

Last edited by Chubler_XL; 03-17-2011 at 08:19 PM..
 

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GLOB(7) 					       BSD Miscellaneous Information Manual						   GLOB(7)

NAME
glob -- shell-style pattern matching DESCRIPTION
Globbing characters (wildcards) are special characters used to perform pattern matching of pathnames and command arguments in the csh(1), ksh(1), and sh(1) shells as well as the C library functions fnmatch(3) and glob(3). A glob pattern is a word containing one or more unquoted '?' or '*' characters, or ``[..]'' sequences. Globs should not be confused with the more powerful regular expressions used by programs such as grep(1). While there is some overlap in the special characters used in regular expressions and globs, their meaning is different. The pattern elements have the following meaning: ? Matches any single character. * Matches any sequence of zero or more characters. [..] Matches any of the characters inside the brackets. Ranges of characters can be specified by separating two characters by a '-' (e.g. ``[a0-9]'' matches the letter 'a' or any digit). In order to represent itself, a '-' must either be quoted or the first or last character in the character list. Similarly, a ']' must be quoted or the first character in the list if it is to represent itself instead of the end of the list. Also, a '!' appearing at the start of the list has special meaning (see below), so to represent itself it must be quoted or appear later in the list. Within a bracket expression, the name of a character class enclosed in '[:' and ':]' stands for the list of all characters belonging to that class. Supported character classes: alnum cntrl lower space alpha digit print upper blank graph punct xdigit These match characters using the macros specified in ctype(3). A character class may not be used as an endpoint of a range. [!..] Like [..], except it matches any character not inside the brackets. Matches the character following it verbatim. This is useful to quote the special characters '?', '*', '[', and '' such that they lose their special meaning. For example, the pattern ``\*[x]?'' matches the string ``*[x]?''. Note that when matching a pathname, the path separator '/', is not matched by a '?', or '*', character or by a ``[..]'' sequence. Thus, /usr/*/*/X11 would match /usr/X11R6/lib/X11 and /usr/X11R6/include/X11 while /usr/*/X11 would not match either. Likewise, /usr/*/bin would match /usr/local/bin but not /usr/bin. SEE ALSO
fnmatch(3), glob(3), re_format(7) HISTORY
In early versions of UNIX, the shell did not do pattern expansion itself. A dedicated program, /etc/glob, was used to perform the expansion and pass the results to a command. In Version 7 AT&T UNIX, with the introduction of the Bourne shell, this functionality was incorporated into the shell itself. BSD
November 30, 2010 BSD
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