Remove Special Characters from String using Regular Expression

The following two examples space also consider as special char so I added /s in pattern. If you don't want you remove that.

1. Remove Special Characters from String using Regular Expression with Matcher.

String inputStr = "Shekhar' reddy* optra# systems?";
String patternStr = "([^a-zA-Z0-9 /s])";
Pattern pattern = Pattern.compile(patternStr);
Matcher matcher = pattern.matcher(inputStr);
StringBuffer buf = new StringBuffer();
while ((matcher.find())) {
matcher.appendReplacement(buf, "");
}
matcher.appendTail(buf);
String result = buf.toString();
System.out.println(result);//Shekhar reddy optra systems

2. Remove Special Characters from String using Regular Expression with split() method.
String inputStr = "Shekhar' reddy* optra# systems?";
String patternStr2 = "[^a-zA-Z0-9 /s]";
Pattern pattern2 = Pattern.compile(patternStr2);
String[] str=pattern2.split(inputStr);
StringBuffer buf1 = new StringBuffer();
for(String str1:str){
buf1.append(str1);
}
System.out.println(buf1);//Shekhar reddy optra systems