[Boost-users] How to skip leading characters

I have an input text file that I read line by line into a standard string. Each line has the following format: Name1 00 12 3a 4c ff … Name2 33 55 5c dd ee … How do create the grammer to skip the leading NameX on each line and put the hex digits into a vector? If the lines had a more complex format such that anything could appear before NameX for example: Bla bla bla : 0a .bb cc NameX 01 22 aa dd 33 44 50 00 … How could I once again get the hex digits after the name into a vector?