用于 Linux 正常运行时间命令/响应的 PHP preg_match

Question

so i am using php to decode up time from Linux commands in a text file

:~>uptime
:~>23:20pm  up   1:58,  1 user,  load average: 0.11, 0.09, 0.11
:~>

I need 1:58 returned.I have tried:

preg_match('/[0-9]{1,2}:[0-9]{2}/', $a, $b); 

but get results for "23:20". Additionally "1:58" can grow into a number like "12:34:56" and I need that also.

I struggle so much with expressions. I appreciate any help.

Answer 1

You can try the following regex:

/[0-9]{1,2}:[0-9]{2}[:]{0,1}[0-9]{0,2}/

This will check if there is another :00 as part of time, it will get it if not then it will ignore. Demo

Edit: Small problem the above regex will also match something like: 12:3342 . So, for that you can use the following regex( DEMO ):

/[0-9]{1,2}:[0-9]{2}(?(?=[:]{1})([:]{1}[0-9]{0,2})())/