使用preg_replace删除php中两个字符串之间的文本 [英] Deleting text between two strings in php using preg_replace

问题描述

我一直在尝试从两个标签之间的站点的字符串中删除一段文本.例如:

I've been trying to remove a section of text from a string the sites betweem two tags. For example:

This is CROPSTART not very CROPEND cool.

...应该变成这个...

...should become this...

This is cool.

这是我尝试过的PHP，通常可以正常工作:

This is the PHP I've tried and generally it works:

preg_replace('#\/\/CROPSTART[\s\S]+\/\/CROPEND#', '', $string);

但是，当字符串包含多个"CROPEND"时，它将裁剪从CROPSTART到最后一个CROPEND的所有内容.我希望它只在第一个CROPSTART和第一个 CROPEND之间裁剪.

However, when the string contains multiple "CROPEND" it crops everything from the CROPSTART to the last CROPEND. I would like it to only crop between the first CROPSTART and the first CROPEND.

有人知道该怎么做吗?

谢谢 元子

推荐答案

但是，当字符串包含多个"CROPEND"时，它将裁剪从CROPSTART到最后一个CROPEND的所有内容.

However, when the string contains multiple "CROPEND" it crops everything from the CROPSTART to the last CROPEND.

这是因为您的+运算符是贪婪的-它不会在CROPEND的第一个实例处停止并继续直到遇到最后一个实例.

This is because your + operator is greedy - it won't stop at the first instance of CROPEND and continue until it encounters the last instance.

只需在其后添加?，即可使用+运算符的非贪婪版本:

You can use a non-greedy version of the + operator simply by appending a ? after it:

preg_replace('/CROPSTART[\s\S]+?CROPEND/', '', $string);

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