DASH UrlTemplate parses template if it contains more than one time ea…

[hugohlln]

With DASH, it's possible to have multiple times each DASH identifier in a template (for example by using a proxy, see Chaos streaming proxy).
This commit allows to compile templates containing more than 4 identifiers (it was not possible before)

[google-cla]

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[microkatz]

Hello @hugohlln,

Thank you for looking to contribute to ExoPlayer. Before we review your Pull Request, you'll need to sign the Contributor License Agreement (CLA). Thank you!

[hugohlln]

Hi @microkatz,

Thanks for yout reply.

Sorry, it's done

[brignolij]

@hugohlln thanks for the fix, will be very helpful.

[sebimag]

@hugohlln Wonderful fix this will help my team and allow us to continue working with exoPlayer

[tiagofsky]

QA will need this, i'm currently struggling with using a proxy with the exoplayer this fix will be very helpful! Thanks @hugohlln

[microkatz]

Hi @hugohlln,

I really appreciate your patience. Also thank you to the other developers for adding your support to this pull request in the comments!

@hugohlln, would you mind adding some unit tests in UrlTemplateTest.java with some segments that have more than one identifier?

[hugohlln]

@microkatz

Thanks for your reply.

I've just added tests in UrlTemplateTest and also changed the regex to match identifiers with escaped dollars.

All tests are sucessfully running

[microkatz]

I'm going to send this for internal review now. You may see some more commits being added as I make changes in response to review feedback. Please refrain from pushing any more substantive changes as it will complicate the internal review - thanks!