From a73f751d9eea2b4eaca780e940f324c9c07119a2 Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Sun, 19 Jan 2020 09:52:02 -0800
Subject: normal: DOI corner-case from pubmed import

---
 python/fatcat_tools/normal.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/python/fatcat_tools/normal.py b/python/fatcat_tools/normal.py
index 7b4bd19c..7a2b5fd9 100644
--- a/python/fatcat_tools/normal.py
+++ b/python/fatcat_tools/normal.py
@@ -40,6 +40,14 @@ def clean_doi(raw):
         raw = raw[11:]
     if raw[7:9] == "//":
         raw = raw[:8] + raw[9:]
+
+    # fatcatd uses same REGEX, but Rust regex rejects these characters, while
+    # python doesn't. DOIs are syntaxtually valid, but very likely to be typos;
+    # for now filter them out.
+    for c in ('¬', ):
+        if c in raw:
+            return None
+
     if not raw.startswith("10."):
         return None
     if not DOI_REGEX.fullmatch(raw):
@@ -56,6 +64,7 @@ def test_clean_doi():
     assert clean_doi("https://dx.doi.org/10.1234/asdf ") == "10.1234/asdf"
     assert clean_doi("doi:10.1234/asdf ") == "10.1234/asdf"
     assert clean_doi("doi:10.1234/ asdf ") == None
+    assert clean_doi("10.4149/gpb¬_2017042") == None  # "logical negation" character
 
 ARXIV_ID_REGEX = re.compile("^(\d{4}.\d{4,5}|[a-z\-]+(\.[A-Z]{2})?/\d{7})(v\d+)?$")
 
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