REGEX search for whole line

[jda]

I'm trying to do a REGEX search for a word or phrase that occupies an 
entire line. For example, finding "second line" in this field:

first line
second line
third line

 From the ICU docs it looks like this should work

  ...WHERE REGEX '^second line$'

but it doesn't (it works if the only words in the field are 'second line').

What would be the correct syntax?

Thanks,

Jon