regular expression: find spaces (tabs/space) but not newlines

Question

how can i have a regular expression that tests for spaces or tabs but not newlines. i tried \s but found out that it tests for newlines too.

i use C#/WPF but it shouldn't matter

Answer 1

Use character classes: [ \t]

Answer 2

Try this character set:

[ \t]

This does only match a space or a tabulator.