voice translation rule problem

[Volodymyr Khrystenko]

Hello. I have a number

221113331114444

What rule I could use to change any 111 to 777? The result should be:

227773337774444

Simple rule

rule 1 /111/ /777/

makes 

227773331114444

The rule change 111 to 777 only once(((

Please help.

[Andrey Chertolyas · Accepted solution]

rule 1 /111\(.*\)111/ /777\1777/

Kind regards,
Andrew C.

[Volodymyr Khrystenko]

Thanks. That works!