Java Utililty Methods String Underscore

List of utility methods to do String Underscore

  1. HOME
  2. Java
  3. S
  4. String Underscore

Description

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

Method

StringtoUnderscore(final String input, final boolean plural)
to Underscore 
StringBuilder out = new StringBuilder();
for (int i = 0; i < input.length(); i++) {
    char c = input.charAt(i);
    if (Character.isUpperCase(c)) {
        if (i > 0) {
            out.append("_");
        out.append(Character.toLowerCase(c));
...
StringtoUnderscore(String s)
Converts camelCaseVersusC to camel_case_versus_c 
StringBuffer buf = new StringBuffer();
char[] ch = s.toCharArray();
for (int i = 0; i < ch.length; ++i) {
    if (Character.isUpperCase(ch[i])) {
        buf.append('_');
        buf.append(Character.toLowerCase(ch[i]));
    } else {
        buf.append(ch[i]);
...
StringtoUnderscore(String text)
to Underscore 
return text.replaceAll("[ \\.-]+", "_");
StringtoUnderscore(String v)
userName -> user_name Password -> _password 
StringBuilder sb = new StringBuilder();
char[] chars = v.toCharArray();
for (char ch : chars) {
    if (ch >= 65 && ch <= 90) {
        sb.append("_");
    sb.append(Character.toLowerCase(ch));
return sb.toString();
StringtoUnderscoreCase(final String s)
Converts an optionally camel-cased character sequence (e.g. 
final char[] chars = s.toCharArray();
final StringBuilder sb = new StringBuilder();
char previousChar = 0;
for (final char aChar : chars) {
    if (Character.isUpperCase(aChar)) {
        if (previousChar != 0) {
            sb.append('_');
        sb.append(Character.toLowerCase(aChar));
    } else {
        sb.append(aChar);
    previousChar = aChar;
return sb.toString();
StringBuildertoUnderscoreCase(String name)
to Underscore Case 
StringBuilder buffer = new StringBuilder();
boolean toLower = false, appendUnderscore = false;
for (int i = 0, len = name.length(); i < len;) {
    char c = name.charAt(i++);
    if (c == '_') {
        if (i == len)
            break;
        if (buffer.length() != 0)
...
StringtoUnderScoreCase(String s)
to Under Score Case 
if (s == null) {
    return null;
return s.replaceAll(String.format("%s|%s|%s", "(?<=[A-Z])(?=[A-Z][a-z])", "(?<=[^A-Z])(?=[A-Z])",
        "(?<=[A-Za-z])(?=[^A-Za-z])"), "_").toLowerCase();
StringtoUnderScoreCase(String s)
to Under Score Case 
if (s == null) {
    return null;
StringBuilder sb = new StringBuilder();
boolean upperCase = false;
for (int i = 0; i < s.length(); i++) {
    char c = s.charAt(i);
    boolean nextUpperCase = true;
...
StringtoUnderscored(String name)
to Underscored 
return toEnglish(name).replaceAll(" ", "_").toLowerCase();
StringtoUnderscoredLowercase(String text)
to Underscored Lowercase 
String result = text.replaceAll("(?<=[a-z0-9])[A-Z]|(?<=[a-zA-Z])[0-9]|(?<=[A-Z])[A-Z](?=[a-z])", "_$0");
result = result.toLowerCase();
return result;