regex to match a single character that is anything but a space
The following should suffice:
[^ ]
If you want to expand that to anything but white-space (line breaks, tabs, spaces, hard spaces):
[^\s]
or
\S # Note this is a CAPITAL 'S'!
-
\smatches any white-space character -
\Smatches any non-white-space character - You can match a space character with just the space character;
-
[^ ]matches anything but a space character.
Pick whichever is most appropriate.