Notebook of Bloody Regex

Aug-2022

Tested in search method of vim editor.

Get single letter [a-z]
Number [0-9]

Get multiple letters, (first letter and the following letters)
\w
[a-z]*

Get multiple letters rather they are lower or uppercase
[a-zA-Z]*

Get single character, use the character itself or
\W matches any non-word character

Practices

Get all text inside "" like a string value in PL

"[^"]"

Get everything inside brackets with the brackets together

{[^}]} means, start with { get all until }₁ and get the last }₂

Get all newline characters after any last-character, if the line ends with (.) or a letter, or a bracket.

[^\n]\n

Replace all multiple emply lines, like every two or three unnecessary empty line into one in the entire document.
  1. Get every EOL ending with any type of char
    –:%s/[^\n]\n/
  2. Add an irrevelant character as a marker by replacing with
    –:%s/[^\n]\n/ÜÜÜ/g
  3. Get marker characters and replace them with newline
    –:%s/ÜÜÜ/\r\g
Get all html tags with opening and enclosing together

Example: <code>some code text</code>

:%s/<\W*code>