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Vim and Regular Expression Cheatsheet

Vim

Opening and closing files

To open a file in vim, just type

vim <filename>

To save and exit files, you must be in command mode (click esc). You must type the : before each of the lettered commands.

  • :q    exit editor
  • :w    save changes
  • :wq  save changes and exit editor
  • :q!    force quit editor without saving changes

Moving through the text

  • h   move the cursor to the left
  • l    move it to the right
  • k   move up
  • j    move down
  • or use the arrow keys

- **^**    move the cursor to the begnning of the line - **$**    move the cursor to the end of the line - **gg**  move the cursor to the beginning of file - **G**    move the cursor to the end of the file

Get into Insert Mode

  • This will allow you to type and make changes just like you would in gedit or similar
  • i   insert mode

To exit editing mode, press ESC key.

Editing Text in Command Mode (The Basics)

  • dd      will delete current line
  • n dd   will delete n lines including and below current line
  • dw   will delete the word to the right of the cursor
  • n dw      will delete n words to the right of the cursor
  • x         will delete letter highlighted by the cursor
  • :n        go to the nth line in the file.

Regular Expressions

[abc] - matches the single characters a,b,c

[a-z] - matches the letters in range a-z

[A-Za-z] - matches the letters in range a-z or A-Z

[A-Za-z0-9] - matches any letter or number

. - any single character

[abc]* - zero or more of a,b,c (any combination)

[abc]+ - one or more of a,b,c (any combination)

(a|b|c) - a, b, or c

Examples

Ensure a domain ends with .com or .org

[A-Za-z0-9]+\.(com|org)

[A-Za-z0-9]+ - one or more letters or numbers
\. - the symbol '.'. Must escape it since in regex it has an alternative meaning
(com|org) - domain must end in com or org

Validate Java Function Name

Regex:  [A-Za-z][A-Za-z0-9_]*

[A-Za-z] - first character of function MUST be a letter
[A-Za-z0-9_]* - the characters after the first (if they exist) can be a letter, number, or underscore.