Trim Data in c++

Dear Experts,
I am a beginner for programming.
I would like to know how to trim data in string in c++

for example as below data i want to all the chanraters until -R1
i want to tring abcdT3-PSD-R1
i only want the last number.
"<subName>abcdT3-PSD-R1</subName>"
"<subName>abcdT2-PSD-R2</subName>"
"<SubName>abcdT2-PSD-R3</subName>"
"<SubName>abcdT66-PSD-R4</subName>"

Thanks

Have a look at std::string class (or MFC CString)