Text+, expression and string

Hi all,
i would like to animate a text+ node with a integer number animated and a arbitrary string in the same node .
I added an user control named "Longueur" (type:number ) and i can animate it,
i added an other user control named "userText" (type:Text)
but i can t find a way to concatenate the two in one expression in the styled Text parameter
my expression is : Longueur,userText
i tried with ";" but i does not work neither.
Have you any ideas to solve this ?
i would like to animate a text+ node with a integer number animated and a arbitrary string in the same node .
I added an user control named "Longueur" (type:number ) and i can animate it,
i added an other user control named "userText" (type:Text)
but i can t find a way to concatenate the two in one expression in the styled Text parameter
my expression is : Longueur,userText
i tried with ";" but i does not work neither.
Have you any ideas to solve this ?