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Full Discussion: Regular Expressions
Top Forums Shell Programming and Scripting Regular Expressions Post 302367459 by DavidHe on Monday 2nd of November 2009 05:18:18 PM
Old 11-02-2009
Hi thank u for your reply. I juz get confused that why ".*\s" does not match "last " Thank you
note that there is a whitespace after double-quoted last

---------- Post updated at 09:18 AM ---------- Previous update was at 09:17 AM ----------

Quote:
Originally Posted by pludi
I guess the OPs question isn't about splitting a string, but rather about how regular expressions work (in this case in Perl).

Let's take a look at the regex you have:
  • ^
    Start (Anchor) at the beginning of the string
  • (\w+)
    Match one or more word character greedily, and save the match in a variable for further use.
  • .*
    Match 0 or more of any character greedily, and discard the result.
  • \s
    Match exactly 1 whitespace character
  • (\w+)
    Again, match one or more word character and save the result.
  • $
    Anchor the regex at the end of the string.

Color coded (not shown: the anchors at the beginning and the end; whitespaces shown as '·'):
Code:
^(\w+).*\s(\w+)$
one·last·challenge



Hi thank u for your reply. I juz get confused that why ".*\s" does not match "last " Thank you
note that there is a whitespace after double-quoted last
 

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FBB::mlm(3bobcat)					      OFoldStream manipulator						 FBB::mlm(3bobcat)

NAME
FBB::mlm - Manipulator modifying left margins of OFoldStream objects SYNOPSIS
#include <bobcat/ofoldstream> or #include <bobcat/ofoldstreambuf> Linking option: -lbobcat DESCRIPTION
The mlm class implements a manipulator that can be inserted into OFoldStream objects to modify the stream's left margin by a requested amount. The request cannot result in a negative left margin value. If a negative left margin would be the arithmetic result of the request then left margin 0 will silently be used. Depending on the tab-setting of the OFoldStream the inserted value represents the number of blank space characters or the number of tab-characters that will be added to the left margin. The request will be processed at the next newline character or std::flush or std::endl manipulator that is inserted into the stream. If a line is still empty once an mlm object and a flush manipulator are inserted into the stream then the new left margin will be effective at the next word inserted into that line (cf., the example section below) A bad_cast exception is thrown when the manipulator is inserted into an ostream that is not using a OFoldStreambuf buffer. NAMESPACE
FBB All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB. INHERITS FROM
- CONSTRUCTOR
o mlm(int addValue): The standard copy constructor is available. MEMBER FUNCTIONS
There are no public or protected member functions in this class. EXAMPLE
#include <iostream> #include <bobcat/ofoldstream> using namespace std; using namespace FBB; int main() { OFoldStream out(cout, 0, 80); out << "hello world (left margin is 0)" << mlm(4) << " " "this uses a 4 character wide left margin " << mlm(-10) << flush << "left margin -6 changed to 0, active on this line "; return 0; } FILES
bobcat/mlm - defines the class interface SEE ALSO
bobcat(7), manipulators(3bobcat), lm(3bobcat), ofoldstream(3bobcat) BUGS
None Reported. DISTRIBUTION FILES
o bobcat_3.01.00-x.dsc: detached signature; o bobcat_3.01.00-x.tar.gz: source archive; o bobcat_3.01.00-x_i386.changes: change log; o libbobcat1_3.01.00-x_*.deb: debian package holding the libraries; o libbobcat1-dev_3.01.00-x_*.deb: debian package holding the libraries, headers and manual pages; o http://sourceforge.net/projects/bobcat: public archive location; BOBCAT
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'. COPYRIGHT
This is free software, distributed under the terms of the GNU General Public License (GPL). AUTHOR
Frank B. Brokken (f.b.brokken@rug.nl). libbobcat1-dev_3.01.00-x.tar.gz 2005-2012 FBB::mlm(3bobcat)
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