JS 数字小数正则

//正负带小数
pattern: /^[+\-]?(?!0\d)\d+(\.\d+)?$/,
//正整数
pattern: /^([1-9]\d*|0)?$/,
//正数带小数
/^[+]{0,1}(\d+)$|^[+]{0,1}(\d+\.\d+)$/

const re = /^[+]{0,1}(\d+)$|^[+]{0,1}(\d+\.\d+)$/
const result = re.test(123131321) // true