From 75ecd039ac5d8da858fa77b44ec882cbde1a37f1 Mon Sep 17 00:00:00 2001
From: Matthijs Kooijman <matthijs@stdin.nl>
Date: Wed, 9 Dec 2009 12:49:53 +0100
Subject: [PATCH] Require a word (including its subscript) to end in a number
 or letter.

---
 pret-lam.lua | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pret-lam.lua b/pret-lam.lua
index 88e3924..feaa5e4 100644
--- a/pret-lam.lua
+++ b/pret-lam.lua
@@ -88,8 +88,12 @@ end
 -- the word taken.
 local function take_word(str)
         -- A word must always start with a-z (in particular, λ is not a valid
-        -- start of a word).
-        res, newstr = utf.match(str, "^([a-zA-Z][%a%d%+%-%,_]+)(.*)")
+        -- start of a word). A word must always end with a letter or a digit
+        res, newstr = utf.match(str, "^([a-zA-Z][%a%d%+%-%,_]*[%a%d]+)(.*)")
+        if not res then
+            -- The above does not catch single letter words
+            res, newstr = utf.match(str, "^([a-zA-Z])(.*)")
+        end
         return res, newstr or str
 end
 
-- 
2.30.2