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

You may use

Find What:      (?|\b(thban\S{0,5})|\s(C3\w+))|(?s:.)
Replace With: (?1$1\n:)

Screenshot & settings

Details

• (?| - start of a branch reset group:
  • \b(thban\S{0,5}) - Group 1: a word boundary, then thban and any 0 to 5 non-whitespace chars
  • | - or
  • \s(C3\w+) - a whitespace char, and then Group 1: C3 and one or more word chars
• ) - end of the branch reset group
• | - or
• (?s:.) - any one char (including line break chars)

The replacement is

• (?1 - if Group 1 matched,
  • $1\n - Group 1 value with a newline
  • : - else, replace with empty string
• ) - end of the conditional replacement pattern

Answer 2

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

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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.