Replace text and regular expressions

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

Special:ReplaceText allows use of regular expressions, see their documentation.

Simple Example

• Page has abcdefghi
  • Original text: abcdef(.*)hi ie want it to match the "g"
  • Replacement text: wx$1yz ie want it to put the matched string between wx and yz
• results in wxgyz

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)