javascript - 匹配日期时无法理解 Javascript 中的正则表达式

Question

所以..这是用于检测给定时间内的小时和分钟的答案代码的一部分

function scheduleMeeting(startTime,durationMinutes) { 
    var [ , meetingStartHour, meetingStartMinutes ] = startTime.match(/^(\d{1,2}):(\d{2})$/) || [];
...
}

这个(/^(\d{1,2}):(\d{2})$/)指的是什么？这真是让我发疯了......

Answer 1

分解正则表达式:

^(\d{1,2})  // From the beginning of string (^) capture exactly one or two digits (hours)
:           // must be a colon
(\d{2})$    // Capture exactly two digits which also should be the end of the string