Distinguish between strings

[bchinfosieeuw]

How can I distinguish between the following strings?

|^  +      ||     +    ||

and

|          ||          ||

The code I am trying to improve is:

std::regex rx ("\\|");
std::regex info("[\\+>\\^~]");
            strnltrim = strnl;
            std::remove(strnltrim.begin(), strnltrim.end(), ' ');
            std::remove(strnltrim.begin(), strnltrim.end(), '|');
            if (std::regex_search(strnl, rx, std::regex_constants::match_continuous) && (std::regex_search(strnlprev, string, std::regex_constants::match_continuous)) && strnlprevempty.empty() && !std::regex_match(strnltrim, info))//empty separating-line
            {
            }
            else if (std::regex_search(strnl, rx, std::regex_constants::match_continuous) )//infoline
            {
            }

Maybe checking if the separating-line does not contain the regex info? Or checking if the separating-line only contains '|' and ' '? I do not get it working, please help.

[SamuelAdams]

2 thoughts

If the 2nd line is considered empty(not counting the pipes), and the entire line is the string, then you can just see if each line is equal to a empty line.

string blankline="|          ||          ||";
string strn1="|         ||          ||";

if (strn1==blankline)
	{cout << "True";}
else
{cout << "False";}

If that's not possible, then just check each char between the pipes seems like it would work.

[JLBorges]

#include <iostream>
#include <string>
#include <regex>

int main()
{
    const std::string bar = "\\|" ; // escaped bar
    const std::string space = "\\s+" ; // one or more spaces (escaped white space)
    const std::string cap = "\\^" ;
    const std::string plus = "\\+" ;

    const std::regex pattern_one( bar + space + bar + bar + space + bar + bar ) ;
    const std::regex pattern_two( bar + cap + space + plus + space + bar + bar + space + plus + space + bar + bar ) ;

    const std::string string_one = "|          ||          ||" ;
    const std::string string_two = "|^  +      ||     +    ||" ;

    if( std::regex_match( string_one, pattern_one ) ) std::cout << "string_one matched pattern_one\n" ;
    if( std::regex_match( string_one, pattern_two ) ) std::cout << "string_one matched pattern_two\n" ;

    if( std::regex_match( string_two, pattern_one ) ) std::cout << "string_two matched pattern_one\n" ;
    if( std::regex_match( string_two, pattern_two ) ) std::cout << "string_two matched pattern_two\n" ;
}

http://coliru.stacked-crooked.com/a/b4e46dee83f85830