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"The <n-th> group in this expression is impossible to match.""This expression is impossible to match.""This expression matches the empty string at every position.""This expression will only ever match the empty string at every position.""This regular expression only produces <m> registers, but <n> variables were provided."all-matches Functionall-string-matches Functioncompile-regular-expression Functioncompiled-regular-expression ClassCompilingDifferences between POSIX and PCRE regexendo-matches Macrofirst-match Functionfirst-string-match FunctionInterfaceIntroductionlint-style-warning Condition TypeLinting and warningsMatchingMatching too muchmatching-too-much-style-warning Condition Typenot-matchable-style-warning Condition TypePrior workregisterSBCL reports a type conflictSyntaxSyntax errorsThe longest match winsThe longest submatch winsThe one-more-re-nightmare ManualType errorsUnreachability