Re: [Haskell-cafe] Newbie: Replacing substring?

Dmitri O.Kondratiev wrote:

I wrote my own version, please criticize:

-- replace all occurances of "123" with "58" in a string: test = replStr "abc123def123gh123ikl" "123" "58"

This is a tricky problem: first of all, you fail your own test! ;-) *Main> test "abc58def58gh58ikl58" (Note the extra 58 at the end.) Other common pitfalls: *Main> replStr "abc1123def" "123" "58" "abc1158def58" (extra 1 ?) *Main> replStr "abc12123def" "123" "58" "abc121258def58" (extra 12 ?) A useful function from Data.List: stripPrefix (Of course, there are more efficient string match algorithms) Regards, Zun.