Doubts about regular expressions W and d regular Expression number python regular expression grep regular expression

    
    $string='April15,2003';$pattern='/(\w+)(\d+),(\d+)/i';$replacement='${1},${3}';echo preg_replace($pattern,$replacement,$string);?>

The result of this expression is april1,2003
Cause: (\w+) can match April15 completely, but because (\d+) is behind (\w+), in order to be able to match defined rules, (\w+) matches April1, (\d+) matches 5
You can change the expression to avoid this situation such as:
$pattern = '/([A-z]) (\d+), (\d+)/I ';

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The above describes the regular expression \w and \d doubts, including the regular expression aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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