Php 如何替换字符串的前三个字符
如何替换字符串中的前三个特殊字符。? 这是样品Php 如何替换字符串的前三个字符,php,regex,Php,Regex,如何替换字符串中的前三个特殊字符。? 这是样品 $string = "~~MASTER FOR OILCHEM; ETD - MID OF JUNE~~"; echo preg_replace("/[^a-zA-Z0-9]/", "", $string); 结果将是: MASTERFOROILCHEMETDMIDOFJUNE MASTER FOR OILCHEM; ETD - MID OF JUNE~~ 但我想替换前三个特殊字符。因此,输出将是: MASTERFOROILCHEMETDM
$string = "~~MASTER FOR OILCHEM; ETD - MID OF JUNE~~";
echo preg_replace("/[^a-zA-Z0-9]/", "", $string);
结果将是:
MASTERFOROILCHEMETDMIDOFJUNE
MASTER FOR OILCHEM; ETD - MID OF JUNE~~
但我想替换前三个特殊字符。因此,输出将是:
MASTERFOROILCHEMETDMIDOFJUNE
MASTER FOR OILCHEM; ETD - MID OF JUNE~~
您可以简单地使用
substr
来代替regex
$string = "~~MASTER FOR OILCHEM; ETD - MID OF JUNE~~";
echo substr($string,2);
以下代码搜索0到3个非单词字符,并将其替换为空字符串:
$string = "~~MASTER FOR OILCHEM; ETD - MID OF JUNE~~";
echo preg_replace("/^\W{0,3}/", "", $string);
上述PHP输出以下内容:
MASTER FOR OILCHEM; ETD - MID OF JUNE~~
请参阅以获取一个实际示例
关于正则表达式,您应该试试这个很棒的工具。子字符串($string,2)如何;同意你的意见+这是我的荣幸。