Member predicate RegexString :: group

Holds if the text in the range start,end is a group

                            
                                
                                    predicate
                                
                                 
                            
                            
                                group
                            
                            
                                (
                                
                                    
                                        int
                                    
                                     
                                    start
                                
                                , 
                                
                                    
                                        int
                                    
                                     
                                    end
                                
                                )