正则怎么过滤出数值？

Question

// 请问正则怎么过滤
let num = '<0.14'  => '0.14'

Answer 1

// => 0.14
'<0.14'.replace(/.*?(\d.?\d+)[\D]*/g, '$1')

Answer 2

'<0.14'.match(/-?\d+(?:\.\d+)?/)

Answer 3

const getNumber = str => (str.match(/\d.?\d*/) || [])[0];

getNumber('<0.14') // 0.14

getNumber('100') // 100