See string module.

Felix uses a binding to the C++ string datatype ::std::basic_string<char>.

  //Check String::subscript
  print$ "hello how are you".[4]; endl;
  print$ "hello how are you".[5 to]; endl;
  print$ "hello how are you".[to 7]; endl;
  print$ "hello how are you".[3 to 8]; endl;
  

o
 how are you
hello h
lo ho

  //Check String::ltrim
  print$ ltrim "hello how are you" "hello"; endl;
  print$ ltrim "hello how are you" "goodbye"; endl;
  

 how are you
hello how are you

  //Check String::rtrim
  print$ rtrim "hello how are you" "you"; endl;
  print$ rtrim "hello how are you" "me"; endl;
  
  

hello how are 
hello how are you

  //Check String::trim
  print$ trim "hello how are you" "me"; endl;
  print$ trim "hello how are you" "hello"; endl;
  print$ trim "hello how are you" "you"; endl;
  
  print$ trim "hello how are hello" "hello"; endl;
  print$ trim "hello how are hello" "goodbye"; endl;
  

hello how are you
 how are you
hello how are 
 how are 
hello how are hello

  //Check String::lstrip
  print$ lstrip "  a b c  "; endl;
  print$ lstrip "a b c  "; endl;
  

a b c  
a b c  

  //Check String::rstrip
  print$ rstrip "  a b c  "; endl;
  print$ rstrip "  a b c"; endl;
  

  a b c
  a b c

  //Check String::strip
  print$ strip "  a b c  "; endl;
  print$ strip "a b c"; endl;
  

a b c
a b c