Parse String to UUID #1006_RevB

parse.kt
### Changes Made
- **Added regex pre-validation**
- **Restructured logic** so `UUID.fromString()` is only called when regex matches
- **Exceptions are no longer default flow** - only thrown in rare edge cases where regex passes but UUID parsing fails
- **Maintained safety** with try/catch around `UUID.fromString()`

### Testing
- All existing test cases unchanged and continue to pass
- Positive test: valid UUID strings → UUID objects
- Negative test: invalid strings → remain String type

Author: EmmanuelBerkowicz

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/api/parse.kt

@@ -63,8 +63,6 @@ import java.time.LocalDate as JavaLocalDate
 import java.time.LocalDateTime as JavaLocalDateTime
 import java.time.LocalTime as JavaLocalTime
 
-
-
 private val logger = KotlinLogging.logger { }
 
 internal interface StringParser<T> {
@@ -494,15 +492,21 @@ internal object Parsers : GlobalParserOptions {
         posixParserToDoubleWithOptions,
         // Boolean
         stringParser<Boolean> { it.toBooleanOrNull() },
-        //UUID
-        stringParser<UUID> {str ->
-            try{
-                UUID.fromString(str)
-            } catch(e: IllegalArgumentException){
+        // UUID
+        stringParser<UUID> { str ->
+
+            val uuidRegex = Regex("[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}")
+
+            if (uuidRegex.matches(str)) {
+                try {
+                    UUID.fromString(str)
+                } catch (e: IllegalArgumentException) {
+                    null
+                }
+            } else {
                 null
             }
         },
-
         // BigInteger
         stringParser<BigInteger> { it.toBigIntegerOrNull() },
         // BigDecimal