Here you can find the source of unescape(String st)
Parameter | Description |
---|---|
st | A string optionally containing standard java escape sequences. |
public static String unescape(String st)
//package com.java2s; /*/*from w w w.ja va 2s .c om*/ * Wegas * http://wegas.albasim.ch * * Copyright (c) 2013 School of Business and Engineering Vaud, Comem * Licensed under the MIT License */ public class Main { /** * * Unescapes a string that contains standard Java escape sequences. * <ul> * <li><strong>\b \f \n \r \t \" \'</strong> : * BS, FF, NL, CR, TAB, double and single quote.</li> * <li><strong>\X \XX \XXX</strong> : Octal character * specification (0 - 377, 0x00 - 0xFF).</li> * <li><strong>\uXXXX</strong> : Hexadecimal based Unicode * character.</li> * </ul> * https://gist.github.com/uklimaschewski/6741769 * * @param st A string optionally containing standard java escape sequences. * @return The translated string. */ public static String unescape(String st) { StringBuilder sb = new StringBuilder(st.length()); for (int i = 0; i < st.length(); i++) { char ch = st.charAt(i); if (ch == '\\') { char nextChar = (i == st.length() - 1) ? '\\' : st .charAt(i + 1); // Octal escape? if (nextChar >= '0' && nextChar <= '7') { String code = "" + nextChar; i++; if ((i < st.length() - 1) && st.charAt(i + 1) >= '0' && st.charAt(i + 1) <= '7') { code += st.charAt(i + 1); i++; if ((i < st.length() - 1) && st.charAt(i + 1) >= '0' && st.charAt(i + 1) <= '7') { code += st.charAt(i + 1); i++; } } sb.append((char) Integer.parseInt(code, 8)); continue; } switch (nextChar) { case '\\': ch = '\\'; break; case 'b': ch = '\b'; break; case 'f': ch = '\f'; break; case 'n': ch = '\n'; break; case 'r': ch = '\r'; break; case 't': ch = '\t'; break; case '\"': ch = '\"'; break; case '\'': ch = '\''; break; // Hex Unicode: u???? case 'u': if (i >= st.length() - 5) { ch = 'u'; break; } int code = Integer.parseInt( "" + st.charAt(i + 2) + st.charAt(i + 3) + st.charAt(i + 4) + st.charAt(i + 5), 16); sb.append(Character.toChars(code)); i += 5; continue; } i++; } sb.append(ch); } return sb.toString(); } }