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

java.util.regex.Matcher.lookingAt()
Attempts to match the input sequence, starting at the beginning of the region, against the pattern.
Like the {@link #matches matches} method, this method always startsat the beginning of the region; unlike that method, it does not require that the entire region be matched.
If the match succeeds then more information can be obtained via the start, end, and group methods.
@return true if, and only if, a prefix of the inputsequence matches this matcher's pattern

  public boolean matchesNationalNumber(String nationalNumber, PhoneNumberDesc numberDesc,
      boolean allowPrefixMatch) {
    Matcher nationalNumberPatternMatcher = regexCache.getPatternForRegex(
        numberDesc.getNationalNumberPattern()).matcher(nationalNumber);
    return nationalNumberPatternMatcher.matches()
        || (allowPrefixMatch && nationalNumberPatternMatcher.lookingAt());
  }


  // @Override
  public boolean matchesPossibleNumber(String nationalNumber, PhoneNumberDesc numberDesc) {
    Matcher possibleNumberPatternMatcher = regexCache.getPatternForRegex(

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      int lastLeadingDigitsPattern =
          Math.min(indexOfLeadingDigitsPattern, format.leadingDigitsPatternSize() - 1);
      Pattern leadingDigitsPattern = regexCache.getPatternForRegex(
          format.getLeadingDigitsPattern(lastLeadingDigitsPattern));
      Matcher m = leadingDigitsPattern.matcher(leadingDigits);
      if (!m.lookingAt()) {
        it.remove();
      }
    }
  }

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      Pattern nationalPrefixForParsing =
          regexCache.getPatternForRegex(currentMetadata.getNationalPrefixForParsing());
      Matcher m = nationalPrefixForParsing.matcher(nationalNumber);
      // Since some national prefix patterns are entirely optional, check that a national prefix
      // could actually be extracted.
      if (m.lookingAt() && m.end() > 0) {
        // When the national prefix is detected, we use international formatting rules instead of
        // national ones, because national formatting rules could contain local formatting rules
        // for numbers entered without area code.
        isCompleteNumber = true;
        startOfNationalNumber = m.end();

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  private boolean attemptToExtractIdd() {
    Pattern internationalPrefix =
        regexCache.getPatternForRegex("\\" + PhoneNumberUtil.PLUS_SIGN + "|" +
            currentMetadata.getInternationalPrefix());
    Matcher iddMatcher = internationalPrefix.matcher(accruedInputWithoutFormatting);
    if (iddMatcher.lookingAt()) {
      isCompleteNumber = true;
      int startOfCountryCallingCode = iddMatcher.end();
      nationalNumber.setLength(0);
      nationalNumber.append(accruedInputWithoutFormatting.substring(startOfCountryCallingCode));
      prefixBeforeNationalNumber.setLength(0);

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    private boolean isAppRefConfigChangeForThisInst(ConfigChange change) {
        String instName = ApplicationServer.getServerContext().getInstanceName();
        Pattern p = Pattern.compile("/domain/servers/server\\[@name='(.*)'\\]/application\\-ref");
        Matcher m = p.matcher(change.getXPath());
        String cfgInst = null;
        if (m.lookingAt()) {
                cfgInst = m.group(1);
        }
        if (cfgInst == null) return true;
        return (instName.equals(cfgInst));
    }

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      // System.err.println("String to match on is " + word);
      Matcher mig = null;
      if (ignoreRegexp != null) {
        mig = ignoreRegexp.matcher(word);
      }
      if (mig != null && mig.lookingAt()) {
        word = word.substring(mig.end());
      } else {
        Matcher m = tokenizerRegexp.matcher(word);
        if (m.lookingAt()) {
          // System.err.println("Matched " + m.end() + " chars: " +

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      }
      if (mig != null && mig.lookingAt()) {
        word = word.substring(mig.end());
      } else {
        Matcher m = tokenizerRegexp.matcher(word);
        if (m.lookingAt()) {
          // System.err.println("Matched " + m.end() + " chars: " +
          //           word.substring(0, m.end()));
          al.add(word.substring(0, m.end()));
          word = word.substring(m.end());
        } else {

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      while(reader.ready()) {
        String line = reader.readLine();
        lineNum = reader.getLineNumber(); //For exception handling


        Matcher m = skipLine.matcher(line);
        if(m.lookingAt()) continue;


        m = setDelim.matcher(line);
        if(m.matches() && paramsForDataset != null) {
          datasetList.add(paramsForDataset);
          paramsForDataset = null;

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        boolean matched = false;
        for(String param : patternsMap.keySet()) {
          Pair<Pattern,Pattern> paramTemplate = patternsMap.get(param);
          Matcher paramToken = paramTemplate.first.matcher(line);


          if(paramToken.lookingAt()) {
            matched = true;
            String[] tokens = line.split(DELIM);


            if(tokens.length != 2) {
              System.err.printf("%s: Skipping malformed parameter in %s (line %d)%n", this.getClass().getName(), configFile,reader.getLineNumber());

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    Pattern vPat = Pattern.compile(valueRegex);
    Pattern sPat = Pattern.compile(separatorRegex);
    List<String> ret = new ArrayList<String>();
    while (str.length() > 0) {
      Matcher vm = vPat.matcher(str);
      if (vm.lookingAt()) {
        ret.add(vm.group());
        str = str.substring(vm.end());
        // String got = vm.group();
        // System.err.println("vmatched " + got + "; now str is " + str);
      } else {

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