Java String Snake Case toSnakeCase(String camelCase)

Description

to Snake Case

License

Open Source License

Declaration

public static String toSnakeCase(String camelCase) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    private static final String SNAKE_CASE_SPLIT_REGEX = "(?<!^)(?<![A-Z])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])";

    public static String toSnakeCase(String camelCase) {
        if (camelCase == null) {
            throw new NullPointerException();
        }//from   w w  w .j ava  2  s  . c  o m

        String[] parts = camelCase.split(SNAKE_CASE_SPLIT_REGEX);

        StringBuilder builder = new StringBuilder(camelCase.length()
                + (parts.length - 1));

        for (int i = 0; i < parts.length - 1; i++) {
            builder.append(parts[i].toLowerCase()).append('_');
        }
        builder.append(parts[parts.length - 1].toLowerCase());

        return builder.toString();
    }
}

Related

1. toSnakeCase(String s)
2. toSnakeCase(String src)
3. toSnakeCase(String str)
4. toSnakeCase(String str)