X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FRegex.h;h=82df2c67bd027eb22d8f37de943766c0920970c9;hb=b09c146b116359616f6cbd4c8b3328607e00ff42;hp=ffe09b19b68b7e41312ec880f9bf27156b277b0a;hpb=c5252da873d547a19069eaf9030fec203f128f66;p=oota-llvm.git

diff --git a/include/llvm/Support/Regex.h b/include/llvm/Support/Regex.h
index ffe09b19b68..82df2c67bd0 100644
--- a/include/llvm/Support/Regex.h
+++ b/include/llvm/Support/Regex.h
@@ -7,7 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements a POSIX regular expression matcher.
+// This file implements a POSIX regular expression matcher.  Both Basic and
+// Extended POSIX regular expressions (ERE) are supported.  EREs were extended
+// to support backreferences in matches.
+// This implementation also supports matching strings with embedded NUL chars.
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,12 +36,14 @@ namespace llvm {
       /// null string after any newline in the string in addition to its normal
       /// function, and the $ anchor matches the null string before any
       /// newline in the string in addition to its normal function.
-      Newline=2
+      Newline=2,
+      /// By default, the POSIX extended regular expression (ERE) syntax is
+      /// assumed. Pass this flag to turn on basic regular expressions (BRE)
+      /// instead.
+      BasicRegex=4
     };
 
-    /// Compiles the given POSIX Extended Regular Expression \p Regex.
-    /// This implementation supports regexes and matching strings with embedded
-    /// NUL characters.
+    /// Compiles the given regular expression \p Regex.
     Regex(StringRef Regex, unsigned Flags = NoFlags);
     ~Regex();