Просто recex js js
// https://regex101.com/r/qyq3PG/1
// or
/^[0-9]*$/
MM.Mirzaei.Dev
// https://regex101.com/r/qyq3PG/1
// or
/^[0-9]*$/str = "hello123!"
str.match(/(\d+)/)[1] //Best way to find first matching number in string ;)/^[\+\-]?\d*\.?\d+(?:[Ee][\+\-]?\d+)?$/
/*
matched values:
-2.14e10
+14E-20
42.69
*/