Java Utililty Methods String Unescape

List of utility methods to do String Unescape

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Description

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

Method

StringunEscapeString(String input)
un Escape String 
return input.replaceAll("&amp;lt;", "<").replaceAll("&amp;gt;", ">");
StringunescapeString(String input)
Convert sequences of characters (into an input string) representing an escape sequence into the corresponding escape sequences 
StringBuilder buf = new StringBuilder("");
int i = 0;
while (i < input.length()) {
    char currChar = input.charAt(i);
    if ((currChar == '\\') && (i < (input.length() - 1))) {
        char toAdd = 0;
        char nextChar = input.charAt(++i);
        if (nextChar == '0') {
...
StringunescapeString(String oldstr)
unescape_perl_string()

Tom Christiansen Sun Nov 28 12:55:24 MST 2010

It's completely ridiculous that there's no standard unescape_java_string function. 

if ((oldstr.charAt(0) != '"' || oldstr.charAt(oldstr.length() - 1) != '"')
        && (oldstr.charAt(0) != '\'' || oldstr.charAt(oldstr.length() - 1) != '\'')) {
oldstr = oldstr.substring(1, oldstr.length() - 1);
StringBuilder newstr = new StringBuilder(oldstr.length());
boolean saw_backslash = false;
for (int i = 0; i < oldstr.length(); i++) {
    int cp = oldstr.codePointAt(i);
...
StringunescapeString(String s)
Unescapes an escaped Unicode string. 
int backSlashIdx = s.indexOf('\\');
if (backSlashIdx == -1) {
    return s;
int startIdx = 0;
int sLength = s.length();
StringBuilder sb = new StringBuilder(sLength);
while (backSlashIdx != -1) {
...
StringunescapeString(String s)
unescape String 
if (s.indexOf('\\') == -1) {
    return s;
StringBuilder sb = new StringBuilder(s.length());
for (int i = 0; i < s.length(); i++) {
    char ch = s.charAt(i);
    if (ch == '\\') {
        int j = i + 1;
...
StringunescapeString(String s)
unescape String 
String value = s;
value = value.replaceAll("^((?<!\\\\) )*", "");
value = value.replaceAll("((?<!\\\\) )*$", "");
value = value.replaceAll("\\\\(\\\\\\\\)* ", " ");
value = value.replaceAll("\\\\(\\\\\\\\)*,", ",");
return value;
StringunescapeString(String s, char enclosed)
unescape String 
if (s.charAt(0) != enclosed)
    return s;
String reg = "\\\\" + enclosed;
String replaced = s.replaceAll(reg, Character.toString(enclosed));
return replaced.substring(1, replaced.length() - 1);
StringunEscapeString(String str)
Unescape commas in the string using the default escape char 
return unEscapeString(str, ESCAPE_CHAR, COMMA);
charunEscapeString(String str)
un Escape String 
if (str.equalsIgnoreCase("&lt;"))
    return '<';
else if (str.equalsIgnoreCase("&gt;"))
    return '>';
else if (str.equalsIgnoreCase("&amp;"))
    return '&';
else if (str.equalsIgnoreCase("&quot;"))
    return '\"';
...
StringunescapeString(String str)
unescape String 
return unescapeString(str, false, true);