CODEWITHSUNDEEP
java
user2059140
user2059140

Reputation: 79

How to put a ignoreCase

I want to put a ignore Upper/Lower case, punctuation, and spaces. Here is the code I want to invoke it into:

public static boolean isPal(String s)
{
    if(s.length() == 0 || s.length() == 1)
        return true;
    if(s.charAt(0) == s.charAt(s.length()-1))
        return isPal(s.substring(1, s.length()-1));
    return false;
}

Upvotes: 1

Views: 263

Answers (3)

iTech
iTech

Reputation: 18450

Easiest way is to convert your string to lower or upper case and do all the comparisons, e.g.

public static boolean isPal(String s)
    {

        s = s.toLowerCase().replaceAll("[^a-z]", "");

        // Or if you want to allow digits
        //s = s.toLowerCase().replaceAll("[^\\w]", "");


        // Do all your comparisons
    }

Upvotes: 1

mtk
mtk

Reputation: 13707

You can convert the string to either case and use it for processing -

public static boolean isPal(String s) {
    s = s.toLowerCase(); // or  s.toUpperCase()

    if(s.length() == 0 || s.length() == 1)
        return true;
    if(s.charAt(0) == s.charAt(s.length()-1))
        return isPal(s.substring(1, s.length()-1));
    return false;
}

And to ignore the punctuation use can use the regex given below. Add more characters that you need to ignore and escape them using a backslash \

[?:\\/\.]

Add it to the replaceAll() method to replace with nothing.

Upvotes: 1

arshajii
arshajii

Reputation: 129537

You could try adding the line:

s = s.toLowerCase().replaceAll("[\\p{Punct}\\s]", "");

at the start of the method.

Upvotes: 5

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