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Full Discussion: problem with sed
Top Forums Shell Programming and Scripting problem with sed Post 302279163 by zaxxon on Thursday 22nd of January 2009 04:19:33 AM
Old 01-22-2009
It does not work because sed takes your 1st grouping between the ( and ) and finds a .* which means any number of any characters and even a blank. Then you try to tell it that a blank shows up, marking the end for the grouping, which it can't parse correctly since there could be a blank inside the brackets too (at least I explain it myself with this thesis of ambigous input). So you have to tell it, that the pattern/grouping exists of any character but NOT a blank:

Code:
..| sed -e 's/.*start="\([^ ]*\) .*/\1/'

I changed the . in front of the * inside the \( and \) to [^ ] which means "anything but no blank". This should work:

Code:
echo ${kk}| sed -e 's/.*start="\([^ ]*\) .*/\1/'
20090124053000

 

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LEARN ABOUT CENTOS

iswblank

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

NAME

       iswblank - test for whitespace wide character

SYNOPSIS

       #include <wctype.h>

       int iswblank(wint_t wc);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       iswblank():
	      _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	      or cc -std=c99

DESCRIPTION

       The  iswblank() function is the wide-character equivalent of the isblank(3) function.  It tests whether wc is a wide character belonging to
       the wide-character class "blank".

       The wide-character class "blank" is a subclass of the wide-character class "space".

       Being a subclass of the wide-character class "space", the wide-character class "blank" is disjoint from the  wide-character  class  "graph"
       and therefore also disjoint from its subclasses "alnum", "alpha", "upper", "lower", "digit", "xdigit", "punct".

       The wide-character class "blank" always contains at least the space character and the control character '	'.

RETURN VALUE

       The  iswblank()	function  returns  nonzero  if wc is a wide character belonging to the wide-character class "blank".  Otherwise it returns
       zero.

CONFORMING TO

       POSIX.1-2001.

NOTES

       The behavior of iswblank() depends on the LC_CTYPE category of the current locale.

SEE ALSO

       isblank(3), iswctype(3)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2010-09-20							       ISWBLANK(3)
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