A start index and a length are obtained for a subset of a text sequence buffered within a parser. A string pool containing a plurality of pooled string objects is polled to determine whether any of the pooled string objects contain the subset of the text sequence buffered within the parser by using the start index and the length. One of the pooled string objects is used if it contains the subset of the text sequence, otherwise, the generation of a new pooled string object in the string pool containing the subset of the text sequence is initiated. Related techniques, apparatus, systems, and articles are described.