Home » What is this error? – FAILED DURING THE BUILDING PHASE

What is this error? – FAILED DURING THE BUILDING PHASE

Solutons:


Here are some steps you can perform to make it working.

  1. Download from http://hackage.haskell.org/package/regex-compat-0.92, unzip to <Haskell Platform INSTALL FOLDER>2014.2.0.0lib
  2. Run Haskell.
  3. Type :mod +Text.Regex to load the package.
  4. Type, e.g. subRegex (mkRegex "[0-9]+") "foobar567" "123"
  5. Result is "foobar123" (after all packages are loaded).

Here is the subRegex description:

:: Regex Search pattern

-> String Input string

-> String Replacement text

-> String Output string

Replaces every occurance of the given regexp with the replacement
string.

In the replacement string, “1” refers to the first substring; “2” to
the second, etc; and “” to the entire match. “\” will insert a
literal backslash.

This does not advance if the regex matches an empty string. This
misfeature is here to match the behavior of the the original
Text.Regex API.

Some cool links that can help you delve deeper:
http://www.serpentine.com/blog/2007/02/27/a-haskell-regular-expression-tutorial/, and
https://wiki.haskell.org/Cookbook/Pattern_matching.

I am using it in Windows, here is my screen:

enter image description here

You shouldn’t import Text.Regex.Posix, but rather just Text.Regex, because the two functions you want are there.

Have a look at the Hackage page – you were almost there, but the functions where actually in that file.

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