Hi @ChakilamG,

1. Create a function similar to removeSpecialChars and add below code in that. 

   StringBuffer OutputString = new StringBuffer(aInput);
   for (int i = 0; i < OutputString.length(); i++) {
   	if ((!Character.isUnicodeIdentifierPart(OutputString.charAt(i))) && ((OutputString.charAt(i)!='/'))) {
   		OutputString.setCharAt(i, '_');
   	}
   }
   return OutputString.toString();

2. This function will take input string and replaces special characters except '/' with _
3. In your DT activity have function like this @replaceAll(@removeSpecialChars1(String),'_','') 

Thanks,

Vinay

Note:

• If you want to change the string as soon as user enters the text in a section you will need to create edit input rule.
• See if you can achieve it through a regex

@ChakilamG

• Create a edit validate rule and place below code in that

StringBuffer OutputString = new StringBuffer(theValue);
for (int i = 0; i < OutputString.length(); i++) {
	if ((!Character.isUnicodeIdentifierPart(OutputString.charAt(i))) && ((OutputString.charAt(i)!='/'))) {
		OutputString.setCharAt(i, '_');
	}
}
String data=OutputString.toString();
data = data.replaceAll("_", "");
theValue=data.toString();

• Use post value action in the section for the text control

Thanks, Vinay