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java - Add text before every vowel

问题描述

Hello I'm trying to add the String OB before every vowel(A,E,I,O,U) in my text. I can assume that the text is made up of all capital letters, no spaces or punctuation. These are handled by other methods I was able to create.

This is what I have so far: 

public static String obify(String s){

    String text = s;
    String[] capVowels = {"A", "E", "I", "O", "U"};
    for (String vow : capVowels){
        text = text.replace(vow, "OB" + vow);
    }
    return text;
}

but when I pass it a sting it prints two OB before the first vowel. Example input: HELLOWOLD , output: HOBOBELLOBOWOBOLD

Any help would be appreciated with an explanation.

标签： javaarraysstringreplacechar

解决方案

You can use a regular expression character class to replace all the vowels with "OB{vowel}" via String#replaceAll. For example

final String test = s.replaceAll("[AEIOU]", "OB$0");

The $0 represents the matched string, ie the vowel.

The reason you're getting duplicate "OB" strings in the result is because of your for-loop. The problem is you add more vowels with each iteration, ie the "O" in "OB", so when you get up to your "O" iteration, it's replacing the ones you added.

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