java - error in replaceAll with escp -


i using open source ocde

private string undoescape(string searchterm) {         string specialchars = "+-&|!(){}[]^\"~:\\";         (int = 0; < specialchars.length(); i++) {             string character = specialchars.substring(i, + 1);             string escaped = "\\" + character;             searchterm = searchterm.replaceall(pattern.quote(escaped), character);         }         return searchterm;     }

in case character = \ in inspect = \

escaped = \\ - in inspect = \

searchterm \\n = in inspect = \n

i got error wrong ?

java.lang.stringindexoutofboundsexception: string index out of range: 1     @ java.lang.string.charat(string.java:658)     @ java.util.regex.matcher.appendreplacement(matcher.java:762)     @ java.util.regex.matcher.replaceall(matcher.java:906)     @ java.lang.string.replaceall(string.java:2162)     @ org

switch replace(), replaces all occurrences doesn't require regex:

private string unescape(string searchterm) {     string specialchars = "+-&|!(){}[]^\"~:\\";     (char c : specialchars.tochararray()) {         string character = string.valueof(c);         string escaped = "\\" + character;         searchterm = searchterm.replace(escaped, character);     }     return searchterm; }

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