Jeroen 🏳️🌈 I’m on iOS and indeed searching the way you describe works perfectly... but only if the separating character is a space.
However, I use invoice numbers with a dash ‘-‘ like ‘2018-0046’ and ‘2018-‘ is found, but (strangely enough) ‘2018-0’ is not, and ‘0046’ neither.
Another example. A customer wrote:
‘factuur:2018-0050’
(WITHOUT a space). Searching for ‘2018’ or even ‘factuur:2’ yielded no result.
So:
• a space seems to be the only delimiter.
• a character other than a letter or a number is treated differently, but not as a delimiter.