Added flags parameter to regexp validation rule

[lenardg]

I added a new option to the regex validation to support regex options. I needed to add the case insensitive option.

The new options enables the developer to pass in RegExp options. For example:

data-val-regex="Please start your sentence with foo or end it with bar!" 
data-val-regex-pattern="^foo|bar$"
data-val-regex-flags="i" />

If no flags are specified, the code behaves like before (the flags parameter becomes undefined)

[mkArtakMSFT]

Hi @lenardg. Thanks for your PR. One of our team members will look into this.

[mkArtakMSFT]

@kichalla, can you please review this when you'll be back? Thanks!

[mkArtakMSFT]

@javiercn, can you please review this? Thanks!

[javiercn]

LGTM, but I don't know how this will play with the equivalent .NET data annotation.

[lenardg]

@javiercn The change is so that the new flags parameter is optional. So it should not need a change or interfere with the .NET data annotations in any way.

[mkArtakMSFT]

Thanks for your PR.
This repo is in maintenance-only mode, and we make only security or critical bug fixes.
Closing the PR as we do not plan to accept this any more.
Sorry that it took us so long to get back to you.