Answer by Kimball Robinson for Regex for string contains?

Depending on your flavor of regular expression - the exact details of regex capabilities vary depending on the language.

I will give javascript examples.

If you don't care about null safety...

str = "blah"str.match(/a/)// [ 'a', index: 2, input: 'blah', groups: undefined ]

Case-sensitive

/test/.test("does this string contain the word testtesttest")// true

Case-insensitive

/test/i.test("Test")

Case-insensitive, ANY word

/\b\w+\b/i.test("bLAH")// true