Examples of java.util.regex.Matcher.replaceFirst()

java.util.regex.Matcher.replaceFirst()
Replaces the first subsequence of the input sequence that matches the pattern with the given replacement string.
This method first resets this matcher. It then scans the input sequence looking for a match of the pattern. Characters that are not part of the match are appended directly to the result string; the match is replaced in the result by the replacement string. The replacement string may contain references to captured subsequences as in the {@link #appendReplacement appendReplacement} method.
Note that backslashes (\) and dollar signs ($) in the replacement string may cause the results to be different than if it were being treated as a literal replacement string. Dollar signs may be treated as references to captured subsequences as described above, and backslashes are used to escape literal characters in the replacement string.
Given the regular expression dog, the input "zzzdogzzzdogzzz", and the replacement string "cat", an invocation of this method on a matcher for that expression would yield the string "zzzcatzzzdogzzz".

Invoking this method changes this matcher's state. If the matcher is to be used in further matching operations then it should first be reset.
@param replacement The replacement string @return The string constructed by replacing the first matchingsubsequence by the replacement string, substituting captured subsequences as needed

    public static String maskURLPassword(String url) {
        final Matcher urlMatcher = URL_PATTERN.matcher(url);
        String maskUrl;
        if (urlMatcher.find()) {
            final Matcher pwdMatcher = PASSWORD_PATTERN.matcher(url);
            maskUrl = pwdMatcher.replaceFirst("\":***@\"");
            return maskUrl;
        }
        return url;
    }

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      String jdbcUrl = toReturn.getProperty("cache.jdbc.url");
      Pattern pattern = Pattern.compile("jbosscache");
      Matcher matcher = pattern.matcher(jdbcUrl);
      boolean found = matcher.find();
      assert found;
      String newJdbcUrl = matcher.replaceFirst(extractTestName() + userIndex.incrementAndGet());
      toReturn.put("cache.jdbc.url", newJdbcUrl);
      return toReturn;
   }


   private static String extractTestName()

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        {
          result = log_matcher.replaceAll(detect_matcher.group(2));
        }
        else
        {
          result = log_matcher.replaceFirst(detect_matcher.group(2));
        }


        if (!last_log.equals(result))
        {
          if (result.length() > 120)

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    Calendar calendar = new GregorianCalendar(timeZone);
    
    //Find if there is any time information in the date
    Matcher matcher = getTimeComponent.matcher(s);
    //Remove the time information in order to not confuse the date parsing
    s = matcher.replaceFirst("").trim();
    
      // handle date with format "2009-01-12 at 03:36:38" by removing trailing " at";
    
    if ( s.endsWith( " at" )){

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            Pattern pattern = inflection.getPattern();
            String replace = inflection.getReplace();
            Matcher matcher = pattern.matcher(str);
            if (matcher.matches())
            {
                return matcher.replaceFirst(replace);
            }
        }
        return str.replaceFirst("([\\w]+)([^s])$", "$1$2s");
    }

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    try{
      String srcText = text;
      Pattern p = Pattern.compile("(.*)\\*(\\S+)\\*(.*)");
      Matcher m = p.matcher(text);
      while(m.matches()){
        srcText = m.replaceFirst("$1" + pre+"$2"+post + "$3");
        m = p.matcher(srcText);
      }
      return srcText;
    }catch(Exception e){

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        //  $rep_type = $1 if( s#^(METAR|SPECI|TESTM|TESTS) ## ) ;
        m = MP.B_metar.matcher(report);
        if (m.find()) {
            field.put("Report_Type", m.group(1));
            report = m.replaceFirst("");
        } else { // default
            field.put("Report_Type", "METAR");
        }
        unit.put("Report_Type", "" );

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        //  $stn_name = $1 if( s#^(\w4) ## ) ;
        m = MP.station.matcher(report);
        if (m.find()) {
            field.put("Station", m.group(1));
            unit.put("Station", "" );
            report = m.replaceFirst(" ");
        } else {
            return false;
        }


        // all patterns from this point are embeded in spaces

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            unit.put("Day", "" );
            field.put("Hour", m.group(2));
            unit.put("Hour", "" );
            field.put("Minute", m.group(3));
            unit.put("Minute", "" );
            report = m.replaceFirst(" ");
        } else {
            return false;
        }


        // skip NIL reports

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            return false;
        }


        m = MP.COR.matcher(report);
        if (m.find()) {
            report = m.replaceFirst(" ");
        }


        //  $AUTO = 1 if( s#AUTO\s+## ) ;
        m = MP.AUTOS.matcher(report);
        if (m.find()) {

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