Simple Regex Problem

Question

ey guys, i've never really been good at regex in any language so i'm looking for some help :) so basically, i am reading a webpage that has multiple subdirectorys and i want to filter out the specific numbers of those directorys, so i guess i want to filter out whats between "?SaleTxt=" and "&nSearchSep", Example:

Directory_Subb_Test.html?SaleTxt=14560&nSearchSep=
Directory_Subb_Test.html?SaleTxt=14559&nSearchSep=
Directory_Subb_Test.html?SaleTxt=14558&nSearchSep=
Directory_Subb_Test.html?SaleTxt=14557&nSearchSep=
Directory_Subb_Test.html?SaleTxt=14555&nSearchSep=
Directory_Subb_Test.html?SaleTxt=14554&nSearchSep=
Directory_Subb_Test.html?SaleTxt=14553&nSearchSep=
Directory_Subb_Test.html?SaleTxt=14552&nSearchSep=
Directory_Subb_Test.html?SaleTxt=14551&nSearchSep=
Directory_Subb_Test.html?SaleTxt=14550&nSearchSep=