regex - a decimal without an integer part -

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i use following expression match decimal number

\d+[.,]?\d+

i trying make digits before decimal separator optional, thought following should do

\d+?[.,]?\d+

but did not, can 1 please explain why?

as trying make match of following examples

    44     44.44     44,44     .44     ,44

i trying make digits before decimal separator optiona

just use * quantifier first \d , set ? quantifier character class:

\d*[.,]?\d+

see regex demo

the reason expression not work \d+? requires @ least 1 digit match.


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