Catch runtime error when creating a Regex from an invalid expression

[aische]

Giving an invalid regex string to the function 'regex' crashes Elm. This is bad if you want to create a regex from user input. A function safeRegex could be added that tries to create the regex, and returns 'Just Regex' if it succeeds, or Nothing in case of an error.

[process-bot]

Thanks for the pull request! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[process-bot]

Thanks for the pull request! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[jvoigtlaender]

This is kind of a duplicate of https://github.com/elm-lang/core/pull/380. I suggest closing it, and continuing discussion there (if need for discussion, rather than decision, exists).

[jvoigtlaender]

This is kind of a duplicate of https://github.com/elm-lang/core/pull/380. I suggest closing it, and continuing discussion there (if need for discussion, rather than decision, exists).

[aische]

Ah I did not see that. Sorry for duplication and the noise!

[aische]

Ah I did not see that. Sorry for duplication and the noise!