RegEx/C/IfDef.regex.txt
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# Matches C/C++ #if/#ifdef/#ifndef .. #endif
(?m)(?<!//)\#\s{0,}(?=if) # As long as we're not after comments, Match the , followed by (?<If>if[^\s]+) # Match <If> (and the rest of the word) (?<Condition>.+?$) # the <Condition> is anything until the end of the line # Now things get tricky. Because ifdefs can nest, we need a balancing group (?> [^\#]+ # Any non-preprocessor character matches, and doesn't change the balance | (?<!//)\#if.+?$(?<Depth>) # An if Increases the <Depth> | (?<!//)\#endif(?<-Depth>) # An EndIf Decreases the Depth | \# # Match any remaining )*(?(Depth)(?!)) # Match Until EndIf is balanced (?<!//)\#endif # Match the endIf |