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+include_regular_expression
+--------------------------
+
+Set the regular expression used for dependency checking.
+
+::
+
+ include_regular_expression(regex_match [regex_complain])
+
+Set the regular expressions used in dependency checking. Only files
+matching ``regex_match`` will be traced as dependencies. Only files
+matching ``regex_complain`` will generate warnings if they cannot be found
+(standard header paths are not searched). The defaults are:
+
+::
+
+ regex_match = "^.*$" (match everything)
+ regex_complain = "^$" (match empty string only)