Extract the absolute time away to show the differences in parsing

This makes it much easier to read what are the differences in parsing
the positive & negative relative times.

Next step is allowing for the CLICS absolute time format

Author: vmcj

webapp/src/Validator/Constraints/TimeStringValidator.php

@@ -11,6 +11,7 @@ class TimeStringValidator extends ConstraintValidator
     public function validate(mixed $value, Constraint $constraint): void
     {
         $timezoneRegex = "[A-Za-z][A-Za-z0-9_\/+-]{1,35}"; # See: https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+        $absoluteRegex = "\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d(\.\d{1,6})? " . $timeZoneRegex;
         $relativeRegex = "\d+:\d\d(:\d\d(\.\d{1,6})?)?";
         if (!$constraint instanceof TimeString) {
             throw new UnexpectedTypeException($constraint, TimeString::class);
@@ -26,8 +27,8 @@ public function validate(mixed $value, Constraint $constraint): void
 
         if ($constraint->allowRelative) {
             $regex   = $constraint->relativeIsPositive ?
-                "/^(\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d(\.\d{1,6})? " . $timeZoneRegex . "|\+?" . $relativeRegex . ")$/" :
-                "/^(\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d(\.\d{1,6})? " . $timeZoneRegex . "|-"   . $relativeRegex . ")$/";
+                "/^(" . $absoluteRegex . "|\+?" . $relativeRegex . ")$/" :
+                "/^(" . $absoluteRegex . "|-"   . $relativeRegex . ")$/";
             $message = $constraint->absoluteRelativeMessage;
         } else {
             $regex   = "/^\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d(\.\d{1,6})? [A-Za-z][A-Za-z0-9_\/+-]{1,35}$/";