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I need a PHP regular expression that matches a line beginning, but not ending, with a phrase. Something like:
$s = 'top bus stop';
$b = preg_match('/^top.*(?!top)$/', $s);
But one that actually works. What do you think?
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To expand the regex to match a complete line, add ‹ . * › at both ends. The dot-asterisk sequences match zero or more characters within the current line.
So use \s\S, which will match ALL characters.
End of String or Line: $ The $ anchor specifies that the preceding pattern must occur at the end of the input string, or before \n at the end of the input string. If you use $ with the RegexOptions. Multiline option, the match can also occur at the end of a line.
You had it almost right. But the final assertion should be (?<!top) a lookbehind assertion using a < prefix. This way it really looks at the preceding three characters before the $ subject end.
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