使用正则表达式检查特殊字符Java

Question

I want to check and see if a word contains a special character and remove it. Lets say I have String word = "hello-there" , I want to loop through and check to see if the word doesn't contain a letter, then remove that special character and concatenate the word. So I want to turn hello-there into hellothere using regex. I have tried this but I can't seem to figure out how to check individual characters of a string to a regex.

public static void main(String[] args){
String word = "hello-there";

for(int i = 0; i < word.length(); i++)
{
    if(word.charAt(i).matches("^[a-zA-Z]+"))

But the last if statement doesn't work. Anybody know how to take care of this?

Answer 1

You may use the following regex , that'll match any character, that is not a lower-case or upper-case letter.

[^a-zA-Z]+ 

see regex demo

Java ( demo )

class RegEx {
    public static void main(String[] args) {
        String s = "hello-there";
        String r = "[^a-zA-Z]+";
        String o = s.replaceAll(r, "");
        System.out.println(o); //-> hellothere
    }
}