How do we achieve the following using replace function in notepad++

Question

Transform

Source: This is source 1
Description : This is the description of source 1
Source: This is source 2
Description : This is a description of source 2

into this:

Description : This is a source 1: This is the description of source 1
Description : This is a source 2: This is the description of source 2

All the examples I have seen append line 2 to line 1 like this:

(^Source.*$)(\r\n)
\1

I need to append line 1 to line 2, and line 3 to line 4 etc.

Answer 1

• Ctrl+H
• Find what: ^Source(:.+)\R(Description\h+)
• Replace with: $2$1
• CHECK Match case
• CHECK Wrap around
• CHECK Regular expression
• UNCHECK . matches newline*
• Replace all

Explanation:

^                   # beginning of line
  Source            # literallly
  (:.+)             # group 1, colon and 1 or more any character but newline
  \R                # any kind of linebreak (i.e. \r, \n, \r\n)
  (                 # group 2
    Description     # literally
    \h+             # 1 or more horizontal spaces
  )                 # end group 2

Replacement:

$2              # content of group 2
$1              # content of group 1

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