regex match a pattern but replace with different values [closed]

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I have a string like "${f1}:blah blah ${f2} blah ${f1}". I have a Map<String, String> with "f1", "f2" as the keys.

I want to replace "${f1}", "${f2}" etc in the string with the corresponding values given in the map.

How do I do that in Java? I have hardly any experience with Java regex.

• james.garriss: Start by reading. Then move to trying. When you get stuck, give us a specific example. Good luck.

Answer 1

try this one

for (Entry<String, String> e : map.entrySet()) {
 String test="${f1}:blah blah ${f2} blah ${f1}";
 System.out.println(test.replace("${f2}", e.getValue()).replace("${f1}", e.getKey()));
 }

Answer 2

You may do it this way

 String str = "${f1}:blah blah ${f2} blah ${f1}";
 Map<String, String> map = new HashMap<String, String>();
 map.put("\\$\\{f1\\}", "xxxx");
 map.put("\\$\\{f2\\}", "yyyy");
 for (Map.Entry entry: map.entrySet()) {
 str = str.replaceAll((String)entry.getKey(), (String)entry.getValue());
 }
 System.out.println(str);

The output is:

xxxx:blah blah yyyy blah xxxx

Answer 3

This type of question has already been asked at SO. you need to see THIS.

• anindyaju99: The others suggested a loop with replacement. That seems like too expensive. This link on the other hand finds out all the ${f1} ${f2} etc and replace them accordingly. So you don't end up traversing the same string multiple times.