From: Robert Klemme <shortcutter@...>
Date: 2009-08-31T16:37:21+09:00
Subject: Re: Regex: Get Class Name

2009/8/31 Brian Candler <b.candler@pobox.com>:
> Ahmet Kilic wrote:
>> This a C++ class name,
>> const std::string DRAPBase::CLASS_NAME = "DRAPBase";
>> I am writing like this
>> classname =  text.scan(/::CLASS_NAME = (.*?)\s+";/)
>> but it is not true.
>
> You're matching `::CLASS_NAME = ' followed by zero or more characters
> followed by one or more space characters followed by ";
>
> It's the "one or more space characters" which doesn't match. Maybe you
> meant \S which means non-space character? e.g.
>
> classname = text.scan /::CLASS_NAME = "(\S+?)";/

I'd probably do

/::CLASS_NAME\s*=\s*"([^"]+)"/

Note to OP: (.*?) is a particular awful construction especially with a
variable length match pattern afterwards.  As long as there is at
least one space (.*?) will always match the empty string in this case:

irb(main):010:0> 5.times {|i| p /(.*?)\s+/ =~ (" " * i), $1, $&, '---'}
nil
nil
nil
"---"
0
""
" "
"---"
0
""
"  "
"---"
0
""
"   "
"---"
0
""
"    "
"---"
=> 5
irb(main):011:0>

Kind regards

robert

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