Use Matcher.appendReplacement() to match [a-zA-Z]+[0-9]+

  

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
  public static void main(String[] argv) throws Exception {

    CharSequence inputStr = "ab12 cd efg34 asdf 123";
    String patternStr = "([a-zA-Z]+[0-9]+)";

    Pattern pattern = Pattern.compile(patternStr);
    Matcher matcher = pattern.matcher(inputStr);

    StringBuffer buf = new StringBuffer();
    boolean found = false;
    while ((found = matcher.find())) {
      String replaceStr = matcher.group();
      matcher.appendReplacement(buf, "found<" + replaceStr + ">");
    }
    matcher.appendTail(buf);

    String result = buf.toString();
    System.out.println(result);
  }
}
//found<ab12> cd found<efg34> asdf 123

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Use Matcher.appendReplacement() to match [a-zA-Z]+[0-9]+ : String Operation « Regular Expressions « Java

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