A dot (.) in regular expression means any character whatsoever except the newline character.
A start (*) means 0 or more occurrence of the previous character.
Therefore the dot-star (.*) combination in a regular expression means "some sequence of characters on the same line" or "simply nothing".
Example content:
<body>
anything goes here...
</body>
Regular expression:
<body>.*</body>
Search result:
Will not match anything
But if the example content is:
<body>anything goes here...</body>
and the Regular is expression as before:
<body>.*</body>
Search result:
Will match the whole string including the <body>...</body> tags.
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