Regex to match valid domain if it comes in beginning of a string

I am trying to match the below criteria with Regex:

1. String starts with http or https
2. It ends with two particular domains (abc.com or xyz.com)
3. There can be anything after abc.com or xyz.com

I wrote below regex for the same:

http
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?:\/\/(.*).(abc|xyz).com\/(.*)

but it fails in below scenario as it shouldn't be matched with the Regex.

http://www.attacker.com/https://events.abc.com/#/en/navigator/init/meetings

Any help much appreciated

You may use

^https?:\/\/([^\/]*\.)?(abc|xyz)\.com\/.*

Regex Demo

You have to check for characters except / before abc|xyz.com

Details

^https?:\/\/: http:// or https:// at the beginning of the string

([^\/]*\.)?: any character except / before FQDN followed by dot, it's optional (?) for cases like //abc.com

(abc|xyz)\.com: match FQDN

\/.*: match / and anything that comes after

You should escape the literals dots (.):
https?:\/\/.*\.(abc|xyz)\.com\/.*
See a demo here.

Of course, if you want to put that in a Java string literal, it's got to be
https?:\\/\\/.*\\.(abc|xyz)\\.com\\/.*

I also removed some unnecessary things from your regex:

1. You don't need to put single letters in a character class (
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   )
2. (.*) doesn't have to be in brackets, but it might be worth it to append a ? to it, so it becomes .*? to avoid greediness of *