String manipulation.Replace

Hello all. I use String manipulation node with such expression: regexReplace($Description$, “.?(\d+(.\d+)?)\s(uF|nF|pF).*”, “$1”), but it doesn’t replace anything and simply return the same string.

Example of initial string: COQ X7S 10.0 uF 50V 10% 1210 ST FLEX. I need to extract the value before uF, in this case it is 10.0