UltraEdit, UltraCompare, UEStudio forums

Hi, Having some difficulty trying to figure how to do the following; Text file with lines such as ab[1]=1[1,abc.........; ab[2]=2[2,xyz.........; ab[3]=3[3,def.........; etc I need to delete the ab[1]=1[ from each line (or replace with a ,). I know [ ] normally used for a range but cannot figure how...