pattern of func

Hi,

1/Got a list mirror of file read that contains these kind of lines:
19 févr. 2018 15:49:09.301 Foo.BarFoo() - FIN TOTAL temps : 0,013ms


2/ attempt to map( the list and retrieve func and time

let patfunc = '\(\S\+()\)'
let pattime = '\(\d\+\,\d\+\)'
let linepat = '^.*'.patfunc.'.*'.pattime.'.*$'

let minitestlist = map(totaltimelist[0:10], 'substitute(v:val, linepat, "\\1 : \\2", "")')



3/ It results in

['o():0,013',....

Why for the first backward ref I got only last char.

Thank you
Niva

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