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Full Discussion: Leading and Trailing Spaces
Top Forums Shell Programming and Scripting Leading and Trailing Spaces Post 42420 by Simerian on Wednesday 29th of October 2003 06:52:29 AM
Old 10-29-2003
Regular Expressions

The pattern represents a regular expression

[ ] denotes a range of characters within the bracketed boundary, in this case a single space.

The following * denotes "0 or more occurences".

Thus, the pattern, [ ]* denotes a pattern match for 0 or more spaces. Places either side of a comma they produce the effect of mathcing a comma surrounded by spaces and then converting the matched string to a single comma.

You may also want to check up on the use of [:space:] which essentially matches any whitespace (i.e. tabs also).
 

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GLOB_MATCH(9)						       libata Core Internals						     GLOB_MATCH(9)

NAME
glob_match - match a text string against a glob-style pattern SYNOPSIS
int glob_match(const char * text, const char * pattern); ARGUMENTS
text the string to be examined pattern the glob-style pattern to be matched against DESCRIPTION
Either/both of text and pattern can be empty strings. Match text against a glob-style pattern, with wildcards and simple sets: ? matches any single character. * matches any run of characters. [xyz] matches a single character from the set: x, y, or z. [a-d] matches a single character from the range: a, b, c, or d. [a-d0-9] matches a single character from either range. The special characters ?, [, -, or *, can be matched using a set, eg. [*] Behaviour with malformed patterns is undefined, though generally reasonable. SAMPLE PATTERNS
"SD1?", "SD1[0-5]", "*R0", "SD*1?[012]*xx" This function uses one level of recursion per '*' in pattern. Since it calls _nothing_ else, and has _no_ explicit local variables, this will not cause stack problems for any reasonable use here. RETURNS
0 on match, 1 otherwise. AUTHOR
Jeff Garzik Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 GLOB_MATCH(9)
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