fix: escape hyphen in regexp, allow unit tests run in old browsers

[lordazzi]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)
Can't run unit tests over Karma on Firefox 31 (our environment) just because one not escaped character inside a regular expression.

What is the new behavior?
Can run the unit tests normally and get the test report.

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[x] No

[vicb]

If this needs to be escaped, it is a bug in the browser, please link to so that we do not remove the \\ by accident later on.

[lordazzi]

You mean to open a issue and link to it?

[vicb]

I guess there must be one already, please try to find it and link there.
At the very least add a comment

[vicb]

alternatively, could you try [-.\\w*], ie move the - first

[lordazzi]

Yes, it make sense, I'll do that

[vicb]

Also please run gulp format to format the code.

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