Description:
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Search for "," (any character) seems not to include linebreak. => wrong behaviour

Test script:
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//search without newline: correct behaviour
$subject="<tag>Hello World</tag>";
echo "[".preg_match('/<tag>[A-Za-z\\s]*<\\/tag>/',$subject)."]\n"; //[1]
echo "[".preg_match('/<tag>[^<]*<\\/tag>/',$subject)."]\n"; //[1]
echo "[".preg_match('/<tag>.*<\\/tag>/',$subject)."]\n"; //[1]

//search with newline: different behaviour on using "."
$subject="<tag>Hello\nWorld</tag>";
echo "[".preg_match('/<tag>[A-Za-z\\s]*<\\/tag>/',$subject)."]\n"; //[1]
echo "[".preg_match('/<tag>[^<]*<\\/tag>/',$subject)."]\n"; //[1]
echo "[".preg_match('/<tag>.*<\\/tag>/',$subject)."]\n"; //[0] WRONG RESULT