doucai5315 2013-08-24 22:24
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正则表达式删除xx。 从一个字符串的开头但只有2位数(代码完成一半)

I'm trying to work out a quick and simple way to remove the first two digits and a decimal from a string, if that is how it is made up.

I am half way there but need help to finish.

So (first is what I start with, 2nd is the result):

xx.yyy       =     yyy
aaaaa        =     aaaaa
test.hello   =     test.hello
a.test.b.x   =     a.test.b.x
aa.bb.cc     =     bb.cc

So it only removes 2 digits and a decimal if it exists like that. If it is three digits and a decimal then it isn't removed.

This is where I am so far:

$string = 'xx.hello';
$pattern = '/(2-digits)./i';
$replacement = ''; // remove if matched
echo preg_replace($pattern, $replacement, $string);

?>
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  • dongzhong9055 2013-08-24 22:43
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    This will do letters, digits, and underscores:

    preg_replace('/^\w{2}\./', '', $string);
    

    Without numbers or underscores, both upper and lowercase:

    preg_replace('/^[a-zA-Z]{2}\./', '', $string);
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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