how to take the first number of the sentence (before the hyphen)

i've this array string..i want to catch the first number:

2 - MICRO_VARIE_LIVE ====> catch 2

3 - index_Top_Live ====> catch3

ans: [2 3]

rule: the number that comes before the non-number character (hyphen) and it is always found at the beginning of the line

Answer 1

[Walter Roberson]

double(extractBefore(VARIABLE, ' -'))