字符串必须包含X个数字（但不一定要加入）

I'm trying to validate phone numbers posted on a contact form

I don't want to be too strict and perhaps block any users from submitting the form with a perfectly OK phone number

Instead, the phone no. should just contain at least (let's say) 6 number digits in total

The string can be anything in any order.. "(44) 123hello88you987howareyou565"

Right now I have this

if (!preg_match('/(\d{6,})/', $phone)) { // throw error }

But it only considers joined numbers

Allow other characters in between the digits:

!preg_match('/(?:\D*\d){6,}/', $phone)