"repeating pair" regex

[Thor]

Hi,

I tried something like this...
auto m = match("a=42 b=32 c=22", regex(`^(?: \s* (\w+)=(\d+) 
)+$`, `x`));

This works fine...
`^(?: \s* (\w+)=(\d+) )+$`
... and if I duplicate the string x times, it also works...

But I'm hoping to parse a variable number of these 'pairs'... so 
I tried grouping the pairs in (?:)+ but this way it saves only 
the last pair?

Anyone got an idea?