Regular Expression-evaluate php regular expressions, and some js regular expressions cannot be used.

A string can only contain Chinese and English characters, numbers, and php regular expressions of & #039;-& #039;, & #039; _ & #039. Use the preg_match () function. A string can only contain Chinese and English, numbers ,'-','_'Php regular expression. Use Preg_match ()Function.

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A string can only containChinese and English, numbers ,'-','_'Php regular expression. UsePreg_match ()Function.

I think you mainly want to solve the problem of matching Chinese characters. Try this.

Preg_match ("/^ [\ x {4e00}-\ x {9fa5}] + $/u", $ str)

If an English number and two symbols are added

Preg_match ("/^ [\ x {4e00}-\ x {9fa5} a-zA-Z0-9 _ \-] + $/u", $ str)

Refer to php Regular Expression matching for Chinese characters. Let's take a look. The author has spent some time on this.