Extends date range parser to support new formats

Adds support for "TO" delimiter and bracket syntax to the two-part date range parser.
This allows for more flexible date range input formats,
including those used by Elasticsearch.

Author: niemyjski

src/Exceptionless.DateTimeExtensions/FormatParsers/FormatParsers/TwoPartFormatParser.cs

@@ -8,9 +8,9 @@ namespace Exceptionless.DateTimeExtensions.FormatParsers;
 [Priority(25)]
 public class TwoPartFormatParser : IFormatParser
 {
-    private static readonly Regex _beginRegex = new(@"^\s*");
+    private static readonly Regex _beginRegex = new(@"^\s*(?:[\[\{])?\s*");
     private static readonly Regex _delimiterRegex = new(@"\G(?:\s*-\s*|\s+TO\s+)", RegexOptions.IgnoreCase);
-    private static readonly Regex _endRegex = new(@"\G\s*$");
+    private static readonly Regex _endRegex = new(@"\G\s*(?:[\]\}])?\s*$");
 
     public TwoPartFormatParser()
     {

tests/Exceptionless.DateTimeExtensions.Tests/FormatParsers/TwoPartFormatParserTests.cs

@@ -22,12 +22,32 @@ public static IEnumerable<object[]> Inputs
         get
         {
             return new[] {
+                // Original dash delimiter syntax
                 new object[] { "2012-2013",        _now.ChangeYear(2012).StartOfYear(), _now.ChangeYear(2013).EndOfYear() },
                 new object[] { "5 days ago - now", _now.SubtractDays(5).StartOfDay(), _now },
                 new object[] { "jan-feb",          _now.ChangeMonth(1).StartOfMonth(), _now.ChangeMonth(2).EndOfMonth() },
                 new object[] { "now-this feb",     _now, _now.AddYears(1).ChangeMonth(2).EndOfMonth() },
+
+                // TO delimiter syntax (case-insensitive)
+                new object[] { "2012 TO 2013",     _now.ChangeYear(2012).StartOfYear(), _now.ChangeYear(2013).EndOfYear() },
+                new object[] { "jan to feb",       _now.ChangeMonth(1).StartOfMonth(), _now.ChangeMonth(2).EndOfMonth() },
+                new object[] { "5 days ago TO now", _now.SubtractDays(5).StartOfDay(), _now },
+
+                // Elasticsearch bracket syntax
+                new object[] { "[2012 TO 2013]",   _now.ChangeYear(2012).StartOfYear(), _now.ChangeYear(2013).EndOfYear() },
+                new object[] { "{jan TO feb}",     _now.ChangeMonth(1).StartOfMonth(), _now.ChangeMonth(2).EndOfMonth() },
+                new object[] { "[2012-2013]",      _now.ChangeYear(2012).StartOfYear(), _now.ChangeYear(2013).EndOfYear() },
+
+                // Wildcard support
+                new object[] { "* TO 2013",        DateTime.MinValue, _now.ChangeYear(2013).EndOfYear() },
+                new object[] { "2012 TO *",        _now.ChangeYear(2012).StartOfYear(), DateTime.MaxValue},
+                new object[] { "[* TO 2013]",      DateTime.MinValue, _now.ChangeYear(2013).EndOfYear() },
+                new object[] { "{2012 TO *}",      _now.ChangeYear(2012).StartOfYear(), DateTime.MaxValue },
+
+                // Invalid inputs
                 new object[] { "blah",             null, null },
-                new object[] { "blah blah",        null, null }
+                new object[] { "[invalid",         null, null },
+                new object[] { "invalid}",         null, null }
             };
         }
     }