zend框架正则表达式问题：“使用模式时出现内部错误”

I've tested my regular expression on multiple testers and I've tried multiple regular expressions too but I keep getting the error: "Internal error while using the pattern '/^(04\d{2}/(\d{2} )\d{2} \d{2})$/'". I know it's probably not the best regex but I couldn't find a good one and I'm not really a pro at this and I have to move on. The phone numbers it should be matching are 04dd/dd dd dd with d being a number between 0 and 9. This is the code I'm using when creating the form.I've tested my regular expression on multiple t