View source for Replace text and regular expressions

Confuses me every time, so hoping to leave example this time. 

[[Special:ReplaceText]] allows use of regular expressions, see [https://www.mediawiki.org/wiki/Extension:Replace_Text#Using_regular_expressions their documentation]. 

===Simple Example===
*Page has <code>abcdefghi</code>
** Original text: <code>abcdef(.*)hi</code> ''ie want it to match the "g"''
** Replacement text: <code>wx$1yz</code> ''ie want it to put the matched string between wx and yz''
*results in <code>wxgyz</code>

=== Example with line end anchor ===
Not sure why it had to be used, but without it the rest of the words didn't get matched. 
* Before text (title): (T) Wrist Joint 
* O: \(T\) (.*)$   ''the $ shows end of line''
* R: $1 (T)
* After text: Wrist Joint (T) 

== Example to match variations with inconsistent capitalization (and I think inconsistent spacing) ==
Two other cents, to find any and all variations. (assuming one template parameter per line)
Search: "(?i)(\n) *\| *tItEl *=.*\n"
Replace: "$1"

== Related articles == 
{{Related Articles}}


[[Category:Wiki use]]