PHP matches Chinese characters

: This article describes how PHP matches Chinese characters. if you are interested in the PHP Tutorial, refer to it. In java, the Chinese character match is [\ u4E00-\ u9FA5]. if you use this regular expression in PHP, the following error is reported:

Warning: preg_match_all (): Compilation failed: PCRE does not support \ L, \ l, \ N {name}, \ U, or \ u at offset 6 in D: \ xampp \ htdocs \ test \ index. php on line 7

In PHP, \ x indicates hexadecimal. Change the regular expression to [\ x4E00-\ x9FA5], but the following error will still be reported:

Warning: preg_match_all (): Compilation failed: invalid UTF-8 string at offset 9 in
D: \ xampp \ htdocs \ test \ index. php on line 7
It seems to be a regular expression problem again. finally, change the regular expression to [\ x {4E00}-\ x {9FA5.

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