Java - removing \u0000 from an String

Question

I\'m using the Twitter API and I have the following string that is bugging me Proyecto de ingeniera comercial, actual Profesora de matemáticas \\u0000\\u0000\\u0000\\u

Answer 1

The first argument to replaceAll is a regular expression, and the Java regex engine understands \uNNNN escapes so

json.replaceAll("\\u0000", "")

will search for the regular expression \u0000, which matches instances of the Unicode NUL character (U+0000), not instances of the actual string \u0000. If you want to match the string \u0000 then you need to use the regular expression \\u0000, which in turn means the Java string literal "\\\\u0000"

json.replaceAll("\\\\u0000", "")

Or more simply, use replace (whose first argument is a literal string rather than a regex) instead of replaceAll

json.replace("\\u0000", "")

Answer 2

string = string.replace("\u0000", ""); // removes NUL chars
string = string.replace("\\u0000", ""); // removes backslash+u0000

The character with u-escaping is done on java source level. For instance "class" is:

public \u0063lass C {

Also you do not need regex.