1 to 9 numbers in javascript code example

Example 1: number pattern js

/^[\+\-]?\d*\.?\d+(?:[Ee][\+\-]?\d+)?$/

/* 
	matched values:
    -2.14e10
    +14E-20
    42.69
*/

Example 2: "[0-9]+"

Just use regex [0-9]+ for matching a number of more than one digit. For example:
grep "[0-9]\+" file.txt