regex

I have a string with some text for instance:

string str = "this is some text $variable some more text $random[1,6]";

Now I want to replace variables that are in map <string, string>.. For instance replace $variable (map->first) with map->second.. and when replacing $random, call a function randomize (in range) and then replace variable with lets say 439204..

I decided to go for boost::regex, but Im unsure what would be the best approach, since I dont have to call random function if I dont have that variable in string.. What do you think would be the best approach for this?

Thanks a lot for help

If regex tools can't do it, do it yourself.

The best solution is to use a language that doesn't make you jump through hoops to accomplish this kind of thing.

Code:

---

#!/usr/bin/perl -w

sub func ($);

%repl = ('$variable' => 'urmfga');
$string = 'this is some text $variable some more text $random[1,6]';

$string =~ s/(\$\S+)/func($1)/ge;

print $string;

sub func ($)
{
        if ($_[0] =~ /\$random\[(\d+),(\d+)\]/)
        {
                int(rand($2 - $1) + $1);
        }
        elsif (exists $repl{$_[0]})
        {
                $repl{$_[0]};
        }
        else
        {
                warn "Failure <$_[0]>\n";
                $_[0];
        }
}

---

zx-1, this is C++ forum. Not a place for scripting languages.

Quote:

---

Originally Posted by maxorator

zx-1, this is C++ forum. Not a place for scripting languages.

---

If you had sat down and contemplated my post, you might have come to the realization that the point I was trying to make was that C/C++ is not the panacea some people think it is. I.e. provided the OP isn't forced to use C++ his problem can be solved with a lot less effort in a language more attuned to it, like Perl, Python, or Ruby.

(Edited language to be somewhat less confrontational)

I guess he wants to use that in his program. Since this is a C++ forum, the rest of the program is in C++.

It is not hard to integrate Perl with C/C++. Maxorator, get your hackles down bro, zx-1 was just showing that C++ may not be the best tool for the job on this one.

Integrate... You mean, install Perl to every computer that the computer runs on?

Maybe start with a simple loop which finds '$' in a string, then extracts the word which follows.
Based on the value of the word, do various things to get a replacement text and then substitute.