replacing the eleventh char in the filename

[adrorla]

hi everyone,
i think mine will be a simple request, i tried but no luck.
i have many file name like this:
123.456.789.000.000.000.aaa.jpg
and need to replace the 3rd point after the 9 number, which is in the 12th position from the start, i should replace it whith an underscore.
i cannot find in BRU any place where i can specify after how many char it can start replacing. it's important for me to mantain the other points in the filename
thank you for any help

[therube]

6:Remove
From: 12 To: 12

7:Add
Insert _ at pos: 12

or...

1:RegEx:

Code: Select all

Match:  (^...........)(.)(.*)
Replace:  \1_\3