Question

I have question how to replace whitespace with _ using notepad++ regex between [] characters

Example :

sl.[Posting date]                       AS TIME, 
'0000-00-00'                            AS edate, 
sl.[Document No_], 
[Original Currency Factor]

Result

sl.[Posting_date]                       AS TIME, 
'0000-00-00'                            AS edate, 
sl.[Document_No_], 
[Original_Currency_Factor]

Answer 1

Find what: [.+(\s)+.+]

Replace with: _

Also don’t forget to select Regular expression radio button in Search mode section.

Update:

Ok, I have one solution but it’s dirty:

You need to perform several replacements to do that.

Find what: (\[.*)\s(.*\])

Replace with: \1_\2

Repeat using Replace all until there will be no occurrences.