How to find all special characters and print them in a given string?
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I need to find all special characters and even the spaces in a sting and print it as a out put..
I have tried the following.
public class SpecialChar {
public static void main(String[] args) {
String s = "adad , dsd r dsdsd,,,,..////";
for (int i = 0; i < s.length(); i++)
{
System.out.println(s.charAt(i));
}
System.out.println("i");
String REGEX = "[^&%$#@!~ ,]*";
Pattern pattern = Pattern.compile(REGEX);
Matcher matcher = pattern.matcher(i);
if (matcher.matches()) {
System.out.println("matched");
}
}
}
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A little regex will work for you :)
public static void main(String[] args) {
String s = "adad , dsd r dsdsd,,,,..////";
System.out.println(s.replaceAll("[a-zA-Z]+", "")); // remove everything apart from "a-z and A-Z"
}
O/P:
, ,,,,..////
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I just want to point out to your problem, you're using the following regex:
[^&%$#@!~ ,]*
which means "any literal expect one of "&%$#@!~ ,".
Note that your set begins with ^, this means that it negates the set and matches every literal that's not in that set.
You have two options: Escape the ^, or move it to the last position.
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I don't know if this is what you need but here it is:
String s = "adad , dsd r dsdsd,,,,..////";
String REGEX = "[,./]";
Pattern pattern = Pattern.compile(REGEX);
Matcher matcher = pattern.matcher(s);
for (int i = 0; i < s.length(); i++) {
if (matcher.find()) {
System.out.println(matcher.group(0));
}
}
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If you do not want to use regex, you could try the following:
public static void main(String[] args) {
String s = "adad , dsd r dsdsd,,,,..////";
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (!Character.isLetterOrDigit(c)) {
System.out.print(c);
}
}
}
Here you use the existing API in Character class which will be used to check if a character is a letter or a digit, if not print it.
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public class SpecialChar {
public static void main(String[] args) {
String s = "adad , dsd r dsdsd,,,,..////";
for (int i = 0; i < s.length(); i++) {
if (!(((int) s.charAt(i) >= 65 && (int) s.charAt(i) <= 90) || ((int) s.charAt(i) >= 97 && (int) s.charAt(i) <= 122)))
System.out.println(s.charAt(i));
}
}
}
