fix regex code smell

Author: t-ober

src/main/java/edu/ie3/datamodel/models/input/system/type/chargingpoint/ChargingPointTypeUtils.java

@@ -169,7 +169,7 @@ public static ChargingPointType parse(String parsableString) throws ChargingPoin
 
     // valid regex for either custom or pre-defined types
     String validCustomRegex =
-        "([\\w \\-_]+)\\s*\\(\\s*(\\d+\\.?\\d+(?:E-?\\d+)?)\\s*\\|\\s*(AC|DC)\\s*\\)";
+        "([\\w \\-]+)\\s*\\(\\s*(\\d+\\.?\\d+(?:E-?\\d+)?)\\s*\\|\\s*(AC|DC)\\s*\\)";
 
     // does it match the valid regex?
     Pattern pattern = Pattern.compile(validCustomRegex);