Regular expression for valid string timezone check

I have requirement to validate timezone format. I am getting timezone in string format like the following way.

It should be like this way. I need to throw an error if anything else comes like +05:30

Valid timezone formats

 0, 1, 2, 3.5, 5.75 .. 12 
-1, -2, -4.5, -11 ... -12

Example timezone format

<option value="-12">(GMT -12:00)</option>
<option value="-11">(GMT -11:00) </option>
<option value="-10">(GMT -10:00)</option>
<option value="-9">(GMT -9:00) Alaska</option>
<option value="-8">(GMT -8:00)</option>
<option value="-7">(GMT -7:00)</option>
<option value="-6">(GMT -6:00)</option>
<option value="-5">(GMT -5:00)</option>
<option value="-4.5">(GMT -4:30)</option>
<option value="-4">(GMT -4:00)</option>
<option value="-3.5">(GMT -3:30) </option>
<option value="-3">(GMT -3:00)</option>
<option value="-2">(GMT -2:00)</option>
<option value="-1">(GMT -1:00 hour)</option>
<option value="0">(GMT)</option>
<option value="1">(GMT +1:00 hour)</option>
<option value="2">(GMT +2:00)</option>
<option value="3">(GMT +3:00)</option>
<option value="3.5">(GMT +3:30)</option>
<option value="4">(GMT +4:00)</option>
<option value="4.5">(GMT +4:30)</option>
<option value="5">(GMT +5:00) </option>
<option value="5.5">(GMT +5:30) </option>
<option value="5.75">(GMT +5:45)</option>
<option value="6">(GMT +6:00)</option>
<option value="6.5">(GMT +6:30)</option>
<option value="7">(GMT +7:00) </option>
<option value="8">(GMT +8:00) </option>
<option value="9">(GMT +9:00) </option>
<option value="9.5">(GMT +9:30) </option>
<option value="10">(GMT +10:00) </option>
<option value="11">(GMT +11:00) </option>
<option value="12">(GMT +12:00)</option>

Could you help me to solve this, i dont have much expertise in using regular expression to show what i had tried. Thanks

Best How To :

^-?\d{1,2}(?:\.\d{1,2})?$

This should do it for you.See demo.

https://regex101.com/r/rU8yP6/8

^(?:-?(?:1[01]|[0-9])(?:\.\d{1,2})?|12)$

https://regex101.com/r/rU8yP6/10

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