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function(check_output name expected)
set(output "${${name}}")
if(NOT output STREQUAL expected)
message(FATAL_ERROR "\"string(REGEX)\" set ${name} to \"${output}\", expected \"${expected}\"")
endif()
endfunction()
# OLD
cmake_policy(SET CMP0186 OLD)
string(REGEX MATCHALL "^0" out "0000")
check_output(out "0;0;0;0")
string(REGEX MATCHALL "^0+" out "0000")
check_output(out "0000")
string(REGEX MATCHALL "^(0|a)" out "0000" )
check_output(out "0;0;0;0")
string(REGEX MATCHALL "^(0|a)" out "aaaa")
check_output(out "a;a;a;a")
string(REGEX MATCHALL "^(0|a)" out "a0a0")
check_output(out "a;0;a;0")
string(REGEX MATCHALL "(^|a)0" out "00a0")
check_output(out "0;0;a0")
string(REGEX REPLACE "^0" "" out "0000")
check_output(out "")
string(REGEX REPLACE "^0" "x" out "0000")
check_output(out "xxxx")
string(REGEX REPLACE "^0+" "x" out "0000")
check_output(out "x")
string(REGEX REPLACE "^(0|a)" "x" out "0000")
check_output(out "xxxx")
string(REGEX REPLACE "^(0|a)" "x" out "aaaa")
check_output(out "xxxx")
string(REGEX REPLACE "^(0|a)" "x" out "a0a0")
check_output(out "xxxx")
string(REGEX REPLACE "(^|a)0" "x" out "00a0")
check_output(out "xxx")
# NEW, same cases as above
cmake_policy(SET CMP0186 NEW)
string(REGEX MATCHALL "^0" out "0000")
check_output(out "0")
string(REGEX MATCHALL "^0+" out "0000")
check_output(out "0000")
string(REGEX MATCHALL "^(0|a)" out "0000")
check_output(out "0")
string(REGEX MATCHALL "^(0|a)" out "aaaa")
check_output(out "a")
string(REGEX MATCHALL "^(0|a)" out "a0a0")
check_output(out "a")
string(REGEX MATCHALL "(^|a)0" out "00a0")
check_output(out "0;a0")
string(REGEX REPLACE "^0" "" out "0000")
check_output(out "000")
string(REGEX REPLACE "^0" "x" out "0000")
check_output(out "x000")
string(REGEX REPLACE "^0+" "x" out "0000")
check_output(out "x")
string(REGEX REPLACE "^(0|a)" "x" out "0000")
check_output(out "x000")
string(REGEX REPLACE "^(0|a)" "x" out "aaaa")
check_output(out "xaaa")
string(REGEX REPLACE "^(0|a)" "x" out "a0a0")
check_output(out "x0a0")
string(REGEX REPLACE "(^|a)0" "x" out "00a0")
check_output(out "x0x")
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