add documentation for filter.regex

src/content/docs/processors/filter/filter.md

@@ -0,0 +1,18 @@
+---
+title: Regex Filter
+sidebar:
+    order: 1
+---
+The `filter.regex` processor matches incoming string payload against a regular expression. If there is a match then the payload is sent through. This processor will return an error if the message being processed is not a string.
+
+- **type**: `filter.regex`
+- **params**:
+    - **pattern**: regex pattern to match against the incoming string
+
+### Example
+Match strings starting with `hello`
+```
+- type: filter.regex
+  params:
+    pattern: "^hello.*"
+```

src/content/docs/processors/string/filter.md

@@ -1,18 +0,0 @@
----
-title: String Filter
-sidebar:
-    order: 4
----
-The `string.filter` processor takes a string and turns it into an array of bytes. This processor will return an error if the message being processed is not a string.
-
-- **type**: `string.filter`
-- **params**:
-    - **pattern**: regex pattern to match against the incoming string
-
-### Example
-Match strings starting with `hello`
-```
-- type: string.filter
-  params:
-    pattern: "^hello.*"
-```