Find the time as hh:mm or hh-mm

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The time can be in the format hours:minutes or hours-minutes. Both hours and minutes have 2 digits: 09:00 or 21-30.

Write a regexp to find time:

          let regexp = /your regexp/g;
alert( "Breakfast at 09:00. Dinner at 21-30".match(regexp) ); // 09:00, 21-30
        

P.S. In this task we assume that the time is always correct, there’s no need to filter out bad strings like “45:67”. Later we’ll deal with that too.

Answer: \d\d[-:]\d\d.

let regexp = /\d\d[-:]\d\d/g;
alert( "Breakfast at 09:00. Dinner at 21-30".match(regexp) ); // 09:00, 21-30

Please note that the dash '-' has a special meaning in square brackets, but only between other characters, not when it’s in the beginning or at the end, so we don’t need to escape it.