Modification of internalCharRegex to avoid conflict with Culture dependant number separators as ' (single quote)

Author: Sébastien Geiser

CodingSeb.ExpressionEvaluator.Tests/ExpressionEvaluatorTests.cs

@@ -1454,7 +1454,6 @@ public static IEnumerable<TestCaseData> TestCasesEvaluateWithSpecificEvaluator
                 {
                     OptionNumberParsingDecimalSeparator = ",",
                     OptionNumberParsingThousandSeparator = "'",
-                    OptionCharEvaluationActive = false,
                     OptionFunctionArgumentsSeparator = ";"
                 }
                 , "Max(1'200,5; 1'111'000,7)")
@@ -1466,7 +1465,6 @@ public static IEnumerable<TestCaseData> TestCasesEvaluateWithSpecificEvaluator
                 {
                     OptionNumberParsingDecimalSeparator = ",",
                     OptionNumberParsingThousandSeparator = "'",
-                    OptionCharEvaluationActive = false,
                     OptionInitializersSeparator = ";"
                 }
                 , "new double[]{1'200,5; 1'111'000,7}.Max()")

CodingSeb.ExpressionEvaluator/ExpressionEvaluator.cs

@@ -38,7 +38,7 @@ public class ExpressionEvaluator
 
         private static readonly Regex otherBasesNumberRegex = new Regex(@"^(?<sign>[+-])?(?<value>0(?<type>x)([0-9a-f][0-9a-f_]*[0-9a-f]|[0-9a-f])|0(?<type>b)([01][01_]*[01]|[01]))", RegexOptions.IgnoreCase | RegexOptions.Compiled);
         private static readonly Regex stringBeginningRegex = new Regex("^(?<interpolated>[$])?(?<escaped>[@])?[\"]", RegexOptions.Compiled);
-        private static readonly Regex internalCharRegex = new Regex(@"^['](\\[']|[^'])*[']", RegexOptions.Compiled);
+        private static readonly Regex internalCharRegex = new Regex(@"^['](\\[\\'0abfnrtv]|[^'])[']", RegexOptions.Compiled);
         private static readonly Regex indexingBeginningRegex = new Regex(@"^[?]?\[", RegexOptions.Compiled);
         private static readonly Regex assignationOrPostFixOperatorRegex = new Regex(@"^\s*((?<assignmentPrefix>[+\-*/%&|^]|<<|>>)?=(?![=>])|(?<postfixOperator>([+][+]|--)(?![" + diactiticsKeywordsRegexPattern + @"0-9])))");
         private static readonly Regex genericsDecodeRegex = new Regex("(?<name>[^,<>]+)(?<isgeneric>[<](?>[^<>]+|(?<gentag>[<])|(?<-gentag>[>]))*(?(gentag)(?!))[>])?", RegexOptions.Compiled);