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Are Regular Expressions in Test Cases for Class Assignments Working?
JohnDutton (1)

I am trying to use regular expressions in test cases and I am unable to get anything other than literal matching to work. Specifically, I am trying to check the output of:

print ("Hello World")

and I have set the regular expression to each of the following without success:

/Hello World/i
/Hello World/
new RegExp(/Hello World/i);

Is this functionality working and I am missing some documentation?

Answered by mat1 (2338) [earned 5 cycles]
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mat1 (2338)

Hey, can you please give us a Repl link so we can help you?
If this is JavaScript, then you need to put a semicolon at the end of the line.
If this is Python, then regexes don't work like that so here's some quick documentation for you. https://docs.python.org/3/library/re.html

Please upvote my comment if it was helpful or useful in any way

JohnDutton (1)

@mat1 This is inside of a test case for a class assignment. It seems that the test cases allow for JS inside since it references https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp in the help. But I've tried every possible permutation of the regular expression to get the test case to work with no luck.

Edit: To clarify, I can't provide a Repl link because it's not on a project, it's about a feature of Repl itself.

n_frost (1)

@JohnDutton Did you ever receive a reply or do you have any idea how to fix, as I can't get it working either (and the 'example' they give doesn't work).

JohnDutton (1)

@n_frost I have received neither. Good to know I'm not the only one!

daveavis (1)

This has been driving me crazy, too, and I finally figured something out. I've gotten regular expressions to work, but I can't get flags to work.

In a Hello World assignment I got the following regular expressions tests to pass. Expected output is "Hello world!"
\w+
(\w)\s(\w)
\w\s\w
[Hh]ello\s[Ww]orld!

It seems that regular expressions work if you don't put the leading and trailing "/". But, this leads to the issue of how to add flags. I'd really like to be able to add flags like "i" for case-insensitivity. Here are some things I tried that didn't work. Maybe someone can figure something out.
hello world!/i
hello world!//i
hello world!\/i
"hello world!"/i
"hello world!",i
RegExp("hello world!", "i")
RegExp('hello world!', 'i')
new RegExp('hello world!', 'i')