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git/export: strip non-alphanumeric characters from patch filenames

--- a/export

+++ b/export

@@ -54,7 +54,7 @@

 			printf "Subject: %s %s\n\n", patch, msg

 			gsub("^[ 	]|[ 	]$", "", msg)

-			gsub("[/ 	]", "-", msg)

+			gsub("[^a-zA-Z0-9_]+", "-", msg)

 			printf "%.4d-%s.patch", n, msg >ENVIRON["patchname"]

 			next

 		}