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

pages/linux/apt-file.md

@@ -17,4 +17,4 @@
 
 - Search for packages that match the regular expresssion given in `pattern`:
 
-`apt-file {{search|find}} --regexp {{pattern}}`
+`apt-file {{search|find}} --regexp {{regular_expression}}`

pages/linux/auracle.md

@@ -5,7 +5,7 @@
 
 - Display AUR packages that match a regular expression:
 
-`auracle search '{{regex}}'`
+`auracle search '{{regular_expression}}'`
 
 - Display package information for a space-separated list of AUR packages:
 

pages/linux/csplit.md

@@ -22,4 +22,4 @@
 
 - Split a file at a line matching a regular expression:
 
-`csplit {{file}} /{{regex}}/`
+`csplit {{file}} /{{regular_expression}}/`

pages/linux/inotifywait.md

@@ -16,7 +16,7 @@
 
 - Exclude files matching a regular expression:
 
-`while inotifywait --recursive {{path/to/directory}} --exlude '{{regex}}'; do {{command}}; done`
+`while inotifywait --recursive {{path/to/directory}} --exlude '{{regular_expression}}'; do {{command}}; done`
 
 - Wait at most 30 seconds:
 

pages/linux/pacman-files.md

@@ -18,7 +18,7 @@
 
 - Find the package that owns a specific file, using a regular expression:
 
-`pacman --files --regex '{{search_pattern}}'`
+`pacman --files --regex '{{regular_expression}}'`
 
 - List only the package names:
 

pages/linux/zgrep.md

@@ -24,7 +24,7 @@
 
 - Use extended regular expressions (supporting `?`, `+`, `{}`, `()` and `|`):
 
-`zgrep -E {{^regex$}} {{path/to/file}}`
+`zgrep -E {{regular_expression}} {{path/to/file}}`
 
 - Print 3 lines of [C]ontext around, [B]efore, or [A]fter each match: