Curl pluggin , REGEX difficulties

[Fabien gerbier]

Hello , 

I'm currently trying to get some temperature in a text file over http  using the pluggin CURL

my file containing the data is very simple 

i have a text file contening this 

-0.8,58.4,2,1484731781

the first value is the value i want to get , 

the value can be négative or postive , 1 or 2 digits , with sometime a decimal 

i tried several regex , 

like this one : 

^-*[0-9]+\.*[0-9]*

collectd is giving me this error : 

localhost collectd[1210]: curl plugin: match_apply failed.
localhost collectd[1210]: utils_match: match_apply: callback failed.

can you give me any information on what is wrong with my regex ?

Thanks 

Fabien