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                # 校驗字符的表達式 ~~~ 1 漢字:^[\u4e00-\u9fa5]{0,}$ 2 英文和數字:^[A-Za-z0-9]+$ 或 ^[A-Za-z0-9]{4,40}$ 3 長度為3-20的所有字符:^.{3,20}$ 4 由26個英文字母組成的字符串:^[A-Za-z]+$ 5 由26個大寫英文字母組成的字符串:^[A-Z]+$ 6 由26個小寫英文字母組成的字符串:^[a-z]+$ 7 由數字和26個英文字母組成的字符串:^[A-Za-z0-9]+$ 8 由數字、26個英文字母或者下劃線組成的字符串:^\w+$ 或 ^\w{3,20}$ 9 中文、英文、數字包括下劃線:^[\u4E00-\u9FA5A-Za-z0-9_]+$ 10 中文、英文、數字但不包括下劃線等符號:^[\u4E00-\u9FA5A-Za-z0-9]+$ 或 ^[\u4E00-\u9FA5A-Za-z0-9]{2,20}$ 11 可以輸入含有^%&',;=?$\"等字符:[^%&',;=?$\x22]+ 12 禁止輸入含有~的字符:[^~\x22]+ ~~~
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