regex - PHP replace all dots to comma -

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this question has answer here:

i have string

10.2, 200.3, 33.00

and want replaced

10,2, 200,3, 33,00

i tried

preg_replace("/[.]$/","/\d[,]$/",$input);

but not replacing!

i can't use str_replace because it's task in university

preg_replace('/\./', ',', $input);

this replace '.' dots ','. 

preg_replace('/(\d+).(\d+)/', '$1,$2', $input);

this more specific need. $1 replaces first digit in parenthesis; $2 second.

-buy me beer nw ;)


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