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-rw-r--r--Modules/ExternalData.cmake2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/ExternalData.cmake b/Modules/ExternalData.cmake
index 8332725..50669bd 100644
--- a/Modules/ExternalData.cmake
+++ b/Modules/ExternalData.cmake
@@ -391,7 +391,7 @@ function(_ExternalData_arg target arg options var_file)
# Regular expression to match associated files.
string(REGEX REPLACE "^REGEX:" "" regex "${opt}")
list(APPEND associated_regex "${regex}")
- elseif("x${opt}" MATCHES "^x:$")
+ elseif(opt STREQUAL ":")
# Activate series matching.
set(series_option "${opt}")
elseif("x${opt}" MATCHES "^[^][:/*?]+$")