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PHP prompts unknown modifier when using regular

2022-04-22 04:49:00 【Day____ Day____ Up】

php Use regular prompts Unknown modifier ')' , It feels strange that regular brackets should be recognized ,  Here's my regular code :

preg_split('|(\t| )+|', $lineData);

It turns out that / Delimiter or # when , You can work normally , The changed code :

preg_split('/(\t| )+/', $lineData);

summary : How does it seem that regular use | When making a delimiter , If you use parentheses, you will report the above error , So use / perhaps # Or some other alternative . 

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