updating regex to handle chinese characters

[manit815]

At present, the current regex doesn't take care of when we are passing filenames having chinese characters.

The bug reproduction steps:
Take three files with names as "平行级_高速轴_中间_001.xml", "平行级_高速轴_叶片侧_001.xml", "平行级_高速轴_电机侧_001.xml" and perform an upload. The uniqueIdentifier was not getting generated, like below:

As a fix for this, we have started respecting chinese characters(unicode) in the regex.

[dmares01]

Since this repo is no longer active I have created a new fork here https://github.com/augustcodes08/resumable-uploads that I will be actively developing. If you are okay with it @manit815 I am going to make these changes in my fork as well. If you would like to keep the commit ownership and be a contributor please feel free to open a PR on that repo