正则表达式从GMT字符串中提取时间

Question

I have strings such as

(GMT -4:00)Puerto Rico
(GMT -3:30)Newfoundland
(GMT -3:00)Asuncion
(GMT +2:00)Athens

How can I extraxt the time from those string? This was my poor shot: \\([0-9](.*?)\\) Result should look like this: -4:00, -3:30, -3:00...

I am very bad at this.

Answer 1

You may use a mere

[-+]\d+:\d+

See the regex demo

Details :

• [-+] - matches - or +
• \\d+ - 1 or more digits
• : - a colon
• \\d+ - 1 or more digits.

C#:

var results = Regex.Matches(s, @"[-+]\d+:\d+", RegexOptions.ECMAScript)
    .Cast<Match>()
    .Select(m => m.Value)
    .ToList();

A possible alternative non-regex solution to process each separate input:

var s = "(GMT -4:00)Puerto Rico";
var res = s.Split(new[] {" ", ")"}, StringSplitOptions.RemoveEmptyEntries)
    .Skip(1)
    .FirstOrDefault();