Use the caret to match the following adjacent characters at the beginning of a string.

For example, `^St` matches the following:
- **St**art here
- **St**and here
- **St**op here

However, `^St` doesn't match the following:
- 1 Start here
- 2 Stand here
- 3 Stop here

The preceding three lines start with a digit and a space, not with the letters "St".

Use this type of regular expression to create segments, filters, or goal steps that match a URI. For example, if you need to isolate data for a particular directory of pages, you can use expressions such as the following:
- `^/mens/` (matches www.example.com**/mens/**)
- `^/womens/` (matches www.example.com**/womens/**)