Examples of java.util.regex.MatchResult.group()

java.util.regex.MatchResult.group()
Returns the input subsequence matched by the previous match.
For a matcher m with input sequence s, the expressions m.group() and s.substring(m.start(), m.end()) are equivalent.

Note that some patterns, for example a*, match the empty string. This method will return the empty string when the pattern successfully matches the empty string in the input.
@return The (possibly empty) subsequence matched by the previous match,in string form @throws IllegalStateException If no match has yet been attempted, or if the previous match operation failed

    private boolean delimiter(StringScanner source, Encoder encoder, Context context) {
        MatchResult m;
        int string_indent = 0;
        if (source.check(STRING) == null && (m = source.scan(DOUBLE_QUOTE)) != null) {
            encoder.beginGroup(TokenType.string);
            encoder.textToken(m.group(), TokenType.delimiter);
            if ((m = source.scan(COMMENT_ONELINE)) != null && !"".equals(m.group())) {
                encoder.textToken(m.group(), TokenType.content);
            }
            if ((m = source.scan(DOUBLE_QUOTE)) != null) {
                encoder.textToken(m.group(), TokenType.delimiter);

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        MatchResult m;
        int string_indent = 0;
        if (source.check(STRING) == null && (m = source.scan(DOUBLE_QUOTE)) != null) {
            encoder.beginGroup(TokenType.string);
            encoder.textToken(m.group(), TokenType.delimiter);
            if ((m = source.scan(COMMENT_ONELINE)) != null && !"".equals(m.group())) {
                encoder.textToken(m.group(), TokenType.content);
            }
            if ((m = source.scan(DOUBLE_QUOTE)) != null) {
                encoder.textToken(m.group(), TokenType.delimiter);
            }

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        int string_indent = 0;
        if (source.check(STRING) == null && (m = source.scan(DOUBLE_QUOTE)) != null) {
            encoder.beginGroup(TokenType.string);
            encoder.textToken(m.group(), TokenType.delimiter);
            if ((m = source.scan(COMMENT_ONELINE)) != null && !"".equals(m.group())) {
                encoder.textToken(m.group(), TokenType.content);
            }
            if ((m = source.scan(DOUBLE_QUOTE)) != null) {
                encoder.textToken(m.group(), TokenType.delimiter);
            }
            encoder.endGroup(TokenType.string);

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            encoder.textToken(m.group(), TokenType.delimiter);
            if ((m = source.scan(COMMENT_ONELINE)) != null && !"".equals(m.group())) {
                encoder.textToken(m.group(), TokenType.content);
            }
            if ((m = source.scan(DOUBLE_QUOTE)) != null) {
                encoder.textToken(m.group(), TokenType.delimiter);
            }
            encoder.endGroup(TokenType.string);
            return true;
        }
        else if ((m = source.scan(LINE_CONTINUE)) != null) {

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            encoder.endGroup(TokenType.string);
            return true;
        }
        else if ((m = source.scan(LINE_CONTINUE)) != null) {
            encoder.beginGroup(TokenType.string);
            encoder.textToken(m.group(), TokenType.delimiter);
            string_indent = context.key_indent != null ? context.key_indent : source.column(source.index() - m.group().length()) - 1;
            if ((m = source.scan(Pattern.compile("(?:\\n+ {" + (string_indent + 1) + "}.*)+"))) != null) {
                encoder.textToken(m.group(), TokenType.content);
            }
            encoder.endGroup(TokenType.string);

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            return true;
        }
        else if ((m = source.scan(LINE_CONTINUE)) != null) {
            encoder.beginGroup(TokenType.string);
            encoder.textToken(m.group(), TokenType.delimiter);
            string_indent = context.key_indent != null ? context.key_indent : source.column(source.index() - m.group().length()) - 1;
            if ((m = source.scan(Pattern.compile("(?:\\n+ {" + (string_indent + 1) + "}.*)+"))) != null) {
                encoder.textToken(m.group(), TokenType.content);
            }
            encoder.endGroup(TokenType.string);
            return true;

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        else if ((m = source.scan(LINE_CONTINUE)) != null) {
            encoder.beginGroup(TokenType.string);
            encoder.textToken(m.group(), TokenType.delimiter);
            string_indent = context.key_indent != null ? context.key_indent : source.column(source.index() - m.group().length()) - 1;
            if ((m = source.scan(Pattern.compile("(?:\\n+ {" + (string_indent + 1) + "}.*)+"))) != null) {
                encoder.textToken(m.group(), TokenType.content);
            }
            encoder.endGroup(TokenType.string);
            return true;
        }
        else if ((m = source.scan(STRING_ENDLINE)) != null) {

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            encoder.endGroup(TokenType.string);
            return true;
        }
        else if ((m = source.scan(STRING_ENDLINE)) != null) {
            encoder.beginGroup(TokenType.string);
            encoder.textToken(m.group(), TokenType.content);
            string_indent = context.key_indent != null ? context.key_indent : source.column(source.index() - m.group().length()) - 1;
            if ((m = source.scan(Pattern.compile("(?:\\n+ {" + (string_indent + 1) + "}.*)+"))) != null) {
                encoder.textToken(m.group(), TokenType.content);
            }

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            return true;
        }
        else if ((m = source.scan(STRING_ENDLINE)) != null) {
            encoder.beginGroup(TokenType.string);
            encoder.textToken(m.group(), TokenType.content);
            string_indent = context.key_indent != null ? context.key_indent : source.column(source.index() - m.group().length()) - 1;
            if ((m = source.scan(Pattern.compile("(?:\\n+ {" + (string_indent + 1) + "}.*)+"))) != null) {
                encoder.textToken(m.group(), TokenType.content);
            }


            encoder.endGroup(TokenType.string);

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        else if ((m = source.scan(STRING_ENDLINE)) != null) {
            encoder.beginGroup(TokenType.string);
            encoder.textToken(m.group(), TokenType.content);
            string_indent = context.key_indent != null ? context.key_indent : source.column(source.index() - m.group().length()) - 1;
            if ((m = source.scan(Pattern.compile("(?:\\n+ {" + (string_indent + 1) + "}.*)+"))) != null) {
                encoder.textToken(m.group(), TokenType.content);
            }


            encoder.endGroup(TokenType.string);
            return true;
        }

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