Need to replace wildcard text between [ ]

[Vistaview]

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 to replace those brackets and the number range (up to 1000) between them.

Thx for thoughts....

[Mofi]

As described in help of UltraEdit/UEStudio at the pages Find command and Regular expressions the escape character for the UltraEdit regex engine is ^ and for Unix/Perl regex it is \.

So the regex for the UltraEdit engine is: %*^[[0-9]+^]=[0-9]+^[

And for Unix/Perl: ^.*\[[0-9]+\]=[0-9]+\[     or    ^.*\[\d+\]=\d+\[