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Top Forums UNIX for Dummies Questions & Answers Importance of \ [ ] + ? in grep Post 302353780 by thanhdat on Wednesday 16th of September 2009 07:41:49 AM
Old 09-16-2009
\( \) is used to remember the pattern so that you can recall it later
"+" means one or more matched pattern
"?" means one or zero matched pattern
So you probably can't replace + with ?

Take a look at this : Regular Expressions
 

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FNMATCH(3)						     Linux Programmer's Manual							FNMATCH(3)

NAME
fnmatch - match filename or pathname SYNOPSIS
#include <fnmatch.h> int fnmatch(const char *pattern, const char *string, int flags); DESCRIPTION
The fnmatch() function checks whether the string argument matches the pattern argument, which is a shell wildcard pattern. The flags argument modifies the behaviour; it is the bitwise OR of zero or more of the following flags: FNM_NOESCAPE If this flag is set, treat backslash as an ordinary character, instead of an escape character. FNM_PATHNAME If this flag is set, match a slash in string only with a slash in pattern and not, for example, with a [] - sequence containing a slash. FNM_PERIOD If this flag is set, a leading period in string has to be matched exactly by a period in pattern. A period is considered to be leading if it is the first character in string, or if both FNM_PATHNAME is set and the period immediately follows a slash. FNM_FILE_NAME This is a GNU synonym for FNM_PATHNAME. FNM_LEADING_DIR If this flag (a GNU extension) is set, the pattern is considered to be matched if it matches an initial segment of string which is followed by a slash. This flag is mainly for the internal use of glibc and is only implemented in certain cases. FNM_CASEFOLD If this flag (a GNU extension) is set, the pattern is matched case-insensitively. RETURN VALUE
Zero if string matches pattern, FNM_NOMATCH if there is no match or another non-zero value if there is an error. CONFORMING TO
ISO/IEC 9945-2: 1993 (POSIX.2). The FNM_FILE_NAME, FNM_LEADING_DIR, and FNM_CASEFOLD flags are GNU extensions. SEE ALSO
sh(1), glob(3), scandir(3), glob(7) GNU
2000-10-15 FNMATCH(3)
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