RegEx string to find two strings and delete the rest of the text in the file

Question

I need to do a find and delete the rest in a text file with notepad+++ i want tu use RegeX to find variations on thban..... the variable always has max 5 chars behind it(see dot

Answer 1

Maybe just capture those words of interest instead of replacing everything else? In Notepad++ search for pattern:

^.*\b(thban\S{0,5})(?:.*(\sC3\w+))?.*$|.+

See the Online Demo

• ^ - Start string ancor.
• .*\b - Any character other than newline zero or more times upto a word-boundary.
• (- Open 1st capture group.
  • thban\S{0,5} - Match "thban" and zero or 5 non-whitespace chars.
  • ) - Close 1st capture group.
• (?: - Open non-capturing group.
  • .* - Any character other than newline zero or more times.
  • ( - Open 2nd capture group.
    • \sC3\w+ - A whitespace character, match "C3" and one ore more word characters.
    • ) - Close 2nd capture group.
  • )? - Close non-capturing group and make it optional.
• .* - Any character other than newline zero or more times.
• $ - End string ancor.
• | - Alternation (OR).
• .+ - Any character other than newline once or more.

Replace with:

$1$2

---

After this, you may end up with empty line you can switly remove using the build-in option. I'm unaware of the english terms so I made a GIF to show you where to find these buttons:

I'm not sure what the english checkbutton is for ignore case. But make sure that is not ticked.