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parseBlockScalar example

                throw new ParseException(sprintf('Reference "%s" does not exist.', $value), $this->currentLineNb + 1, $this->currentLine, $this->filename);
            }

            return $this->refs[$value];
        }

        if (\in_array($value[0], ['!', '|', '>'], true) && self::preg_match('/^(?:'.self::TAG_PATTERN.' +)?'.self::BLOCK_SCALAR_HEADER_PATTERN.'$/', $value, $matches)) {
            $modifiers = $matches['modifiers'] ?? '';

            $data = $this->parseBlockScalar($matches['separator'], preg_replace('#\d+#', '', $modifiers), abs((int) $modifiers));

            if ('' !== $matches['tag'] && '!' !== $matches['tag']) {
                if ('!!binary' === $matches['tag']) {
                    return Inline::evaluateBinaryScalar($data);
                }

                return new TaggedValue(substr($matches['tag'], 1), $data);
            }

            return $data;
        }