How to remove all substrings from a string

Question

How to remove all instances of the pattern from a string?

string str = \"red tuna, blue tuna, black tuna, one tuna\";
string pattern = \"tuna\";

Answer 1

This is the basic logic for better understanding Here is the code in c++

    string s,x;                //s is the string , x is the substring
    int a,l; 
    cin>>s>>x;
    l=x.length();
    while(true)
    {
        a=s.find(x);
        if(a==-1)
        {break;}                       // if substring is not found
        else
        {
        s.erase(a,l);                  //if substring is found 
        }
    }
    if(s.length()==0)                  // if string length becomes null printing 0 
        cout<<0<<"\n";      
    else 
        cout<

example: input-shahaha output-shha