在VIM中常用的正则表达式

" Tip 1: Add extra characters before the first character of each line
s/^(.)/- \1/


" Tip 1.1: Comment lines of code
s/^(.)/# \1/

" Tip 1.2: Comment lines by adding # before the first letter
s/^( +)(.)/\1# \2/

" Tip 2: remove all trailing white space characters
s/\s+$//

" Tip 3: search class and method definition
^\(class\| *def\) \+\w\+