I want to delete all comments in an android project, all the comments start with // or any other specific characters?
Note: I'm answering myself I figure it out
In android studio, right-click on the project and select Replace in files, a new window pop up
1 in the first search field tape in this ^\s+//.*$
2 in the second search field, keep it empty if you just want to delete all the lines that start with //
3 now hit replace all button.
if you want to delete other lines that start with different characters, example @ the expression should be like this ^\s+@.*$