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Full Discussion: Regular expression match
Top Forums Shell Programming and Scripting Regular expression match Post 302948781 by Don Cragun on Thursday 2nd of July 2015 01:06:03 PM
Old 07-02-2015
The part that I found strange about the given ERE is that it will accept dates like 2015115 (which is ambiguous) as well as 2015-1-15 and 2015-11-5 (both of which are clear as to where the break is between the month and day). And, although 20151-15 and 201511-5 might be unambiguous, I'm not sure that I would want to accept them as "valid" date input (and both of these are also accepted by the given ERE).
 

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

NAME
strpbrk - search a string for any of a set of bytes SYNOPSIS
#include <string.h> char *strpbrk(const char *s, const char *accept); DESCRIPTION
The strpbrk() function locates the first occurrence in the string s of any of the bytes in the string accept. RETURN VALUE
The strpbrk() function returns a pointer to the byte in s that matches one of the bytes in accept, or NULL if no such byte is found. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------+---------------+---------+ |Interface | Attribute | Value | +----------+---------------+---------+ |strpbrk() | Thread safety | MT-Safe | +----------+---------------+---------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD. SEE ALSO
index(3), memchr(3), rindex(3), strchr(3), string(3), strsep(3), strspn(3), strstr(3), strtok(3), wcspbrk(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2015-08-08 STRPBRK(3)
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