java - Replace with regular expression a character with other by index? -

is possible replace character in string in java, using specific character indice of match.

for example:

i want use specific map:

a=d , b=e , c=f

then: want replace d, b e , c f.

this idea of code:

    string src = "text_abc";     string regex = "a|b|c";     string replacement = "d|e|f";     string replaced = src.replace(regex, replacement); 

i don't know regular expression should use in regex , replacement this.

you can use string.replace(char, char) case.

string src = "text_abc"; string replaced = src.replace('a', 'd')                      .replace('b', 'e')                      .replace('c', 'f'); 

if insist on using regular expressions (which silly idea case, it's inefficient , unnecessarily unmaintainable), can use map corresponding look-up replacement:

string src = "text_abc";  // can move these class level reuse. final hashmap<string, string> map = new hashmap<>(); map.put("a", "d"); map.put("b", "e"); map.put("c", "f"); final pattern pattern = pattern.compile("[abc]");  string replaced = src; matcher matcher; while ((matcher = pattern.matcher(replaced)).find())     replaced = matcher.replacefirst(map.get(matcher.group()));  // system.out.println(replaced); 

here online code demo.