Notes from Qubit Inc. - Regular Expressions

This article currently covers notepad++ flavor or regular expressions.

Notepad++

notepad++ regex utilizes token \1, \2 to replace with matched terms under (.*).

Example table for find and replace,

Intent	Find	Replace
Replace `-> D:\movies\superman.mkv` with `'superman'` (add quotes around)	`-> D:\\movies\\new\\(.*)`	`'\1'`
Replace the string starting with a space( ) and ending with `: convert`	`^ (.*): convert$` and keep the matched part quoted around	`'\1'`
Replace `NSLog(@x)` with `printf(x)`	`(NSLog\(@)(.*) (;)`	`printf(\2`
Remove line numbers from output of bash `history` cmd	`^ 7..`	`null`
Converting a batch script variables to Powershell variables	`^([0-9][0-9][0-9] )(.*)`	`\2`
Remove number prefixes from bash history file	`^\s*(\d\|\d\d\|\d\d\d)\s\s(\S)`	`\2`
Copying from github which contains line numbers as prefixes, then, removing line numbers	`^([0-9][0-9][0-9] )(.*)`	`\2`
Given dependency repos name list, regular expression for clone repo	`(.*)`	`clone_repo /builds/atiq/jv8/\1 \1 false`

null above represents empty string.

Please note that replacement is not necessary if we only want to find.

Notepad++ Trips and Tricks

Following SU - Flip or reverse line order in notepad++ we can reverse line orders for given text. Example use is in soln of the problem: 12. Integer to Roman

** Config Files ** config files can be found inside: $Env:APPDATA\Notepad++

configs for npp: custom backup: $PFilesX64DIR\npp\backup Theme: $Env:APPDATA\Notepad++\themes Themes settings Path: $Env:APPDATA\Notepad++