fix: Handle escape sequences

Correct the handling of escape sequences in string literals.

Don't replace escape sequences in regex expressions, for example, \r or \n. In the parser, these sequences start with \\. Same for \s, don't replace it with a whitespace, since this is also a part of a regex.

Handle \\ to avoid that the sequence is escaped and returned as \\\\.

Author: saig0

src/main/scala/org/camunda/feel/impl/parser/FeelParser.scala

@@ -694,22 +694,16 @@ object FeelParser {
     }.getOrElse(ConstNull)
   }
 
-  // replace escaped character with the provided replacement
   private def translateEscapes(input: String): String = {
-    val escapeMap = Map(
-      "\\b"  -> "\b",
-      "\\t"  -> "\t",
-      "\\n"  -> "\n",
-      "\\f"  -> "\f",
-      "\\r"  -> "\r",
-      "\\\"" -> "\"",
-      "\\'"  -> "'",
-      "\\s"  -> " "
-      // Add more escape sequences as needed
-    )
-
-    escapeMap.foldLeft(input) { case (result, (escape, replacement)) =>
-      result.replace(escape, replacement)
-    }
+    // replace all escape sequences
+    input
+      .replaceAll("(?<!\\\\)\\\\n", "\n")  // new line
+      .replaceAll("(?<!\\\\)\\\\r", "\r")  // carriage return
+      .replaceAll("(?<!\\\\)\\\\t", "\t")  // tab
+      .replaceAll("(?<!\\\\)\\\\b", "\b")  // backspace
+      .replaceAll("(?<!\\\\)\\\\f", "\f")  // form feed
+      .replaceAll("(?<!\\\\)\\\\'", "'")   // single quote
+      .replaceAll("(?<!\\\\)\\\\\"", "\"") // double quote
+      .replaceAll("\\\\\\\\", "\\\\")      // backslash (for regex characters)
   }
 }