[QGIS-Developer] QGIS expression: Formatting numbers with leading zeros

[Neumann, Andreas]

Hi, 

Is there a way in a QGIS expression to format numbers with leading zeros
up to n places before the decimal point? E.g. 1 should be 00001, 10
should be 00010, etc. 

I would need this for correct sorting. 

I know, I could probably write a python expression, or something
complicated with CASE WHEN, but I'd like to avoid that. 

Perhaps something is already existing? 

Andreas
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