mlibbey commented on a change in pull request #8235:
URL: https://github.com/apache/trafficserver/pull/8235#discussion_r687741883



##########
File path: doc/admin-guide/plugins/header_rewrite.en.rst
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@@ -858,6 +858,22 @@ change just the hostname via::
   cond %{HEADER:X-Mobile} = "foo"
   set-destination HOST foo.mobile.bar.com [L]
 
+Regex Substitutions
+-------------------
+
+As mentioned above, regex operands are available to match a condition's 
provided value against
+a regular expression. The substitution elements from these conditional 
replacement patterns
+can be used in operators within the same header rewriting rule.
+
+For example, ``$ number`` can be used to capture the number group in the 
replacement

Review comment:
       Is there a max number of capture groups? if so, perhaps `(where number 
is between 1 and ...)`




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