multiple pages: normalize regular expression instead of regex, regexp or pattern (#5830)

pages/common/recsel.md

@@ -9,8 +9,8 @@
 
 - Use "~" to match a string with a given regular expression:
 
-`recsel -e "{{field_name}} ~ '{{pattern_regex}}' {{data.rec}}"`
+`recsel -e "{{field_name}} ~ '{{regular_expression}}' {{data.rec}}"`
 
 - Use a predicate to match a name and a version:
 
-`recsel -e "name ~ '{{pattern_regex}}' && version ~ '{{pattern_regex}}'" {{data.rec}}`
+`recsel -e "name ~ '{{regular_expression}}' && version ~ '{{regular_expression}}'" {{data.rec}}`