Java regex simple lookaheads#1646
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…regex-simple-assertions # Conflicts: # core/src/main/antlr4/org/evomaster/core/parser/RegexJava.g4 # core/src/main/kotlin/org/evomaster/core/parser/GeneRegexJavaVisitor.kt
lmasroca
commented
Jul 20, 2026
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| internal class RegexHandlerTest{ | ||
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| @Disabled("Needs to hande lookahead in regex") |
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This test needed (?iu), which is not actually lookahead but embedded flags (in particular Unicode case insensitive), which we support already.
jgaleotti
requested changes
Jul 21, 2026
| override val canBeZeroWidth: Boolean = false | ||
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| override fun tryForce(value: String): Int { | ||
| require(value.isNotEmpty()) |
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is this require always used? does it throw illegalArgumentException if not satisfied?
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require(value: Boolean) throws IllegalArgumentException when value is false, no-op if value is true. Here it should always be true unless we have a bug, as tryForce's call sites should not allow this.
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Should we replace require(bool) usages with if(!bool) throw IllegalArgumentException?
…ding cross-attempt mutation contamination.
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Added support for basic java regex lookaheads.
This PR introduces a check to
RegexGenes for which theRegexTypeisJVM, in which we check its randomized value after eachrandomize()for a match against its compiled java pattern. If the sampled value does not match we trigger repairs, which aim at repairing the assertions in the regex. These are repaired by sampling a value from the lookahead's internalDisjunctionListRxGeneand attempting to force that value into the following genes. This is safely done as we check if the genes can actually take that value or not before forcing them. We attempt these repairs a couple of times before giving up and throwing.We still do not support nested lookaheads (nested inside a group or nested within another lookahead) as the repair mechanism can not handle them yet. The current repairs this PR introduces can only repair regex genes that are on the same level as the lookahead itself (the
termsof aDisjunctionRxGene). This also does not yet properly handle multiple concatenated lookaheads as the current repair logic steps over the previous repairs if a new repair is triggered.Note: this PR adds a new gene
AssertionRxGeneas well as a new interfaceRxAbsorbablewhich is implemented by regex genes.