Java Utililty Methods String Snake Case

List of utility methods to do String Snake Case

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Description

The list of methods to do String Snake Case are organized into topic(s).

Method

StringtoSnakeCase(String camelCase)
to Snake Case 
if (camelCase == null) {
    throw new NullPointerException();
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();
StringtoSnakeCase(String s)
to Snake Case 
return s.replaceAll("([a-z])([A-Z])", "$1_$2").toLowerCase();
StringtoSnakeCase(String src)
to Snake Case 
String dst = new String();
for (int i = 0; i < src.length(); i++) {
    char c = src.charAt(i);
    if ('A' <= c && c <= 'Z') {
        c += 32;
        if (i != 0) {
            dst += '_';
    dst += c;
return dst;
StringtoSnakeCase(String str)
Convert a string to snake_case 
return str.replaceAll("([a-z])([A-Z])", "$1_$2").toLowerCase();
StringtoSnakeCase(String str)
Transforms a string to underscore-delimited representation. 
StringBuilder sb = new StringBuilder();
for (char c : str.toCharArray()) {
    if (Character.isLetter(c) || Character.isDigit(c)) {
        if (Character.isUpperCase(c)) {
            if (sb.length() > 0) {
                sb.append("_");
            sb.append(Character.toLowerCase(c));
...
StringtoSnakeCase(String str, boolean capitalize, Boolean upper)
to Snake Case 
return changeSeparator(str, '_', capitalize, null, upper);