[Feature Request] Search and Repleace with capture groups

[stefanbols]

Issue Description

As a user I want to be able to search and replace with capture groups.

For example when wanting to add an underscore to every variable initialized with null, using capture groups.

Will replace the following:

    let documentRepresentation = null;
    let regexOccurrenceMap = null;
    let index = null;

with

    let _documentRepresentation = null;
    let _regexOccurrenceMap = null;
    let _index = null;