Modified the polynomial regular expression to remove the ambiguity

[AnastasiiaSvietlova]

Goal

Modify the regular expression to remove the ambiguity, or ensure that the strings matched with the regular expression are short enough that the time-complexity does not matter.

Changeset

Updated RegExp and added .trim() for trimming whitespaces in ret

Testing

Covered by existing unit test

[github-actions]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	43.80 kB	13.43 kB
After	43.80 kB	13.43 kB
±	No change	No change

code coverage diff

<temporarily disabled>

Generated by 🚫 dangerJS against 381ed78

[gingerbenw]

Suggested change

	## TBD
	## [Unreleased]