How to delete all comment lines in IDEA?

keyboardShortcut
Control + R - Replace

Type -->

 \s//.*  

Select .* in right top of replace window . then it will select all comment like this --> //

Thank you @Bas Leijdekkers

You could use Find & Replace (Ctrl/Cmd+R). Search In Comments Only (option under the little cog menu), enable regex search and search for string ^//.*. Replace with the empty string.