Add a note about regex metacharacter escaping

1 files changed, 5 insertions, 0 deletions

diff --git a/tpl b/tpl
index 0db0604..56fe958 100755
--- a/tpl
+++ b/tpl
@@ -32,6 +32,11 @@ FILENAME == ARGV[1] && NF == 2 {
 		match(matched_text, /[^\{\}[:space:]]+/)
 		var_name = substr(matched_text, RSTART, RLENGTH)
 
+		# Even though matched_text contains the { and } regex
+		# metacharacters, we don't need to escape them because they're
+		# not used in a way that matches the (r){m,n} syntax.
+		# (We don't need to escape them elsewhere in this program
+		# either, but we do so for maximum clarity.)
 		sub(matched_text, vals[var_name], $2)
 	}