1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/*
*
* Copyright (c) 1998-2000
* Dr John Maddock
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Dr John Maddock makes no representations
* about the suitability of this software for any purpose.
* It is provided "as is" without express or implied warranty.
*
*/
/*
* LOCATION: see http://www.boost.org for most recent version.
* FILE regex_split_example_2.cpp
* VERSION see <boost/version.hpp>
* DESCRIPTION: regex_split example: spit out linked URL's.
*/
#include <list>
#include <fstream>
#include <iostream>
#include <iterator>
#include <boost/regex.hpp>
boost::regex e("<\\s*A\\s+[^>]*href\\s*=\\s*\"([^\"]*)\"",
boost::regbase::normal | boost::regbase::icase);
void load_file(std::string& s, std::istream& is)
{
s.erase();
//
// attempt to grow string buffer to match file size,
// this doesn't always work...
s.reserve(is.rdbuf()->in_avail());
char c;
while(is.get(c))
{
// use logarithmic growth stategy, in case
// in_avail (above) returned zero:
if(s.capacity() == s.size())
s.reserve(s.capacity() * 3);
s.append(1, c);
}
}
int main(int argc, char** argv)
{
std::string s;
std::list<std::string> l;
int i;
for(i = 1; i < argc; ++i)
{
std::cout << "Findings URL's in " << argv[i] << ":" << std::endl;
s.erase();
std::ifstream is(argv[i]);
load_file(s, is);
boost::regex_split(std::back_inserter(l), s, e);
while(l.size())
{
s = *(l.begin());
l.pop_front();
std::cout << s << std::endl;
}
}
//
// alternative method:
// split one match at a time and output direct to
// cout via ostream_iterator<std::string>....
//
for(i = 1; i < argc; ++i)
{
std::cout << "Findings URL's in " << argv[i] << ":" << std::endl;
s.erase();
std::ifstream is(argv[i]);
load_file(s, is);
while(boost::regex_split(std::ostream_iterator<std::string>(std::cout), s, e, boost::match_default, 1)) std::cout << std::endl;
}
return 0;
}
|
