Fix syntaxes matching not working sometimes (fixes #26)

Before this commit, automatic syntaxes matching wasn't working if there were
characters before the part with the syntax markers. This commit fixes that and
adds unit tests in order to prevent regressions.

Author: Pietro Albini

botogram/syntaxes.py

@@ -9,23 +9,23 @@
 import re
 
 
-_markdown_re = re.compile(r"("
+_markdown_re = re.compile(r".*("
                           r"\*(.*)\*|"
                           r"_(.*)_|"
                           r"\[(.*)\]\((.*)\)|"
                           r"`(.*)`|"
                           r"```(.*)```"
-                          r")")
+                          r").*")
 
-_html_re = re.compile(r"("
+_html_re = re.compile(r".*("
                       r"<b>(.*)<\/b>|"
                       r"<strong>(.*)<\/strong>|"
                       r"<i>(.*)<\/i>|"
                       r"<em>(.*)<\/em>|"
                       r"<a\shref=\"(.*)\">(.*)<\/a>|"
                       r"<code>(.*)<\/code>|"
                       r"<pre>(.*)<\/pre>"
-                      r")")
+                      r").*")
 
 
 def is_markdown(message):

tests/test_syntaxes.py

@@ -16,8 +16,10 @@ def test_is_markdown():
 
     for delimiter in "*", "_", "`", "```":
         assert botogram.syntaxes.is_markdown(delimiter+"a"+delimiter)
+        assert botogram.syntaxes.is_markdown("!"+delimiter+"a"+delimiter+"!")
 
     assert botogram.syntaxes.is_markdown("[a](b)")
+    assert botogram.syntaxes.is_markdown("![a](b)!")
 
 
 def test_is_html():
@@ -26,10 +28,12 @@ def test_is_html():
 
     for tag in "b", "strong", "i", "em", "pre", "code":
         assert botogram.syntaxes.is_html("<"+tag+">a</"+tag+">")
+        assert botogram.syntaxes.is_html("!<"+tag+">a</"+tag+">!")
 
     assert not botogram.syntaxes.is_html("<a>a</a>")
     assert not botogram.syntaxes.is_html("<a test=\"b\">a</a>")
     assert botogram.syntaxes.is_html("<a href=\"b\">a</a>")
+    assert botogram.syntaxes.is_html("!<a href=\"b\">a</a>!")
 
 
 def test_guess_syntax():