Question

I have trouble finding a regex matching this pattern:

• A numeric (decimal separator can be . or ,), followed by
• a dash -, followed by
• a numeric (decimal separator can be . or ,), followed by
• a semi-column or a space character

This pattern can be repeated one or more time.

The following examples should match the regex:

1-2;
1-2;3-4;5-6;
1,0-2;
1.0-2;
1,0-2.0;
1-2 3-4;
1-2 3,00-4;5.0-6;

The following examples should not match the regex:

1-2
1 2;
1_2;
1-2;3-4

Answer 1

Edit updated based on moving of 1 2; to non-match.

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This should work:

@"^(\d+([,.]\d+)?-\d+([,.]\d+)?[ ;])+(?<=;)$"

Explanation

^              //Start of the string.
(              //Start of group to be repeated. You can also use (?=
\d+            //One or more digits.
([,.]\d+)?     //With an optional decimal
-              //Separated by a dash
\d+([,.]\d+)?  //Same as before.
[ ;]           //Terminated by a semi-colon or a space
)+             //One or more of these groups.
(?<=;)         //The last char before the end needs to be a semi-colon
$              //End of string.