Glue crawler - File with delimiter 1f▼

Input raw data (txt) file contains column delimiter as 1f ▼ that is (ASCII Code 31 / Hexadecimal 1F / Unicode Symbol ␟ US) , a file generated by mainframe without header. When tried to use custom CSV classifier, couldn't input more characters as allows only one character with 'Other' option. How to make Glue crawler read the metadata it into catalogue? Pl. suggest