How to remove characters with non-Chinese characters, non-letters, not numbers in strings

How do I remove characters that are not Chinese, non-alphanumeric, or non-numeric in strings?
How to remove all characters from non-Chinese characters, not letters, non-numerals, very visible punctuation (commas, periods, backslashes) in strings

References

such as: 4/13の Troubled (☀,∴ ... 3??? ...? Three Ⅲ)?? Love me Chinese = = Yang "Turn" in China

Filtered: 4/13 troubled 9728 Love me China Yang Wei turn

------Solution--------------------
You mean as long as the numbers are English letters?
Preg_match ("/^[a-z0-9]+[^_]$/g", $a); handwriting is not measured. See the Class library for yourself

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