fix bounds in the "c-file" character regex

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3341 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

doc/nanorc.sample

@@ -198,7 +198,7 @@
 # color brightyellow "\<(try|throw|catch|operator|new|delete)\>"
 # color magenta "\<(goto|continue|break|return)\>"
 # color brightcyan "^[[:space:]]*#[[:space:]]*(define|undef|include|ifn?def|endif|elif|else|if|warning|error)"
-# color brightmagenta "'([^'\]|(\\["'abfnrtv\\]))'" "'\\(([0-3]?[0-7]{,2}))'" "'\\x[0-9A-Fa-f]{,2}'"
+# color brightmagenta "'([^'\]|(\\["'abfnrtv\\]))'" "'\\(([0-3]?[0-7]{1,2}))'" "'\\x[0-9A-Fa-f]{1,2}'"
 ##
 ## GCC builtins
 ##