New nodes: 'Regex Contains', 'Regex Replace', 'Regex Find', 'Regex Find All', and 'Regex Split' (#4045)

* Add a family of 5 regex nodes for string processing

* Fix unstaged change

node-graph/nodes/text/src/lib.rs

@@ -1,6 +1,7 @@
 mod font_cache;
 pub mod json;
 mod path_builder;
+pub mod regex;
 mod text_context;
 mod to_path;