fix unescaped ^ in math selection

[ddellspe]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

Escaping the carat operator for processing as it allows for empty string to match at the start of a line.
This appears to be escaped now in the original bundle

Possible Drawbacks

If people are currently relying on bad regex for their use of this, it may cause them to break