From dccd408a9c22e9120dcf50f1c107bff71778ee45 Mon Sep 17 00:00:00 2001
From: "Matthias C. M. Troffaes" <matthias.troffaes@gmail.com>
Date: Wed, 18 Feb 2015 13:54:25 +0000
Subject: Allow digit as first character of a citation key.

* Update parser to recognize citation keys starting with a digit.
* Update documentation accordingly.
* Test case added.

See https://github.com/jgm/pandoc-citeproc/issues/97
---
 src/Text/Pandoc/Parsing.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/Text/Pandoc/Parsing.hs')

diff --git a/src/Text/Pandoc/Parsing.hs b/src/Text/Pandoc/Parsing.hs
index 28ea2bd2f..facf4d3b9 100644
--- a/src/Text/Pandoc/Parsing.hs
+++ b/src/Text/Pandoc/Parsing.hs
@@ -1212,7 +1212,7 @@ citeKey = try $ do
   guard =<< notAfterString
   suppress_author <- option False (char '-' *> return True)
   char '@'
-  firstChar <- letter <|> char '_'
+  firstChar <- alphaNum <|> char '_'
   let regchar = satisfy (\c -> isAlphaNum c || c == '_')
   let internal p = try $ p <* lookAhead regchar
   rest <- many $ regchar <|> internal (oneOf ":.#$%&-+?<>~/")
-- 
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