preg_replace使用PHP开始和结束文本的一部分

要替换它们之间的内容ABC,CED您可以使用Positive Lookbehind和Positive Lookahead来保留ABC和CED,并将其替换为您想要的内容.如果两者之间的文本也包含换行符,则可以使用s修饰符强制点.也匹配换行符.

$str = 'text here ABC -some text here- 
CED text here';

$str = preg_replace('/(?<=ABC).*?(?=CED)/si', ' foo ', $str);
echo $str;

看到 Working demo

正则表达式:

(?<=           look behind to see if there is:
 ABC           'ABC'
)              end of look-behind
 .*?           any character except \n (0 or more times)
 (?=           look ahead to see if there is:
  CED          'CED'
 )             end of look-ahead