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We present a novel length-aware solving algorithm for the quantifier-freefirst-order theory over regex membership predicate and linear arithmetic overstring length. We implement and evaluate this algorithm and related heuristicsin the Z3 theorem prover. A crucial insight that underpins our algorithm isthat real-world instances contain a wealth of information about upper and lowerbounds on lengths of strings under constraints, and such information can beused very effectively to simplify operations on automata representing regularexpressions. Additionally, we present a number of novel general heuristics,such as the prefix/suffix method, that can be used in conjunction with avariety of regex solving algorithms, making them more efficient. We showcasethe power of our algorithm and heuristics via an extensive empirical evaluationover a large and diverse benchmark of 57256 regex-heavy instances, almost 75%of which are derived from industrial applications or contributed by othersolver developers. Our solver outperforms five other state-of-the-art stringsolvers, namely, CVC4, OSTRICH, Z3seq, Z3str3, and Z3-Trau, over thisbenchmark, in particular achieving a 2.4x speedup over CVC4, 4.4x speedup overZ3seq, 6.4x speedup over Z3-Trau, 9.1x speedup over Z3str3, and 13x speedupover OSTRICH.

An SMT Solver for Regular Expressions and Linear Arithmetic over String Length