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We test for APU, thus the error statement should tell same;
APR and APU are independent before APR 2.0.


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- minor bump for ap_expr_exec_re() introduced in r1037504
- actually commit the changes to allow using backreferences in SetEnvIfExpr
- automatically add the correct entries to the Vary-header if the result of
  an expression evaluation depends on a request header
  (can be turned off by setting the AP_EXPR_FLAGS_DONT_VARY flag)
- set AP_EXPR_FLAGS_DONT_VARY in mod_log_config's conditional logging
- fix various off-by-one errors in req_table_func


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- implement regex backreferences and make them available for setting 
  envvars in SetEnvIfExpr
- implement nested function calls in %-syntax: %{func1:%{func2:arg}} 
- actually implement evaluation of concatenation operator (oops...)
- Fix <If ... > treating an internal error as success


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an URL to be specified to include on error.


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naming of other modules.


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Trying to get rid of old- or un-facts.
./build.sh all


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with the module that is calling ap_expr_exec()


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(There was no actual problem as id is never set to a negative value.)


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One-bit flags should really be unsigned


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PR: 50292


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