find and replace

• https://www.cnblogs.com/skyhacker/archive/2012/01/03/2311437.html

find

• M-x isearch-forward or C-s
• M-x isearch-backward or C-r
• M-x iy-go-to-char
• M-x jump-char
• M-x spacemacs/helm-project-do-ag or SPC s a p

replace

• M-%