Flutter-da faqat raqamlar va harflarni kiritishga ruxsat beruvchi TextField yaratish uchun siz kiritilgan matnni tasdiqlash va kiritishni ruxsat berish yoki cheklash uchun muntazam ifodadan foydalanishingiz mumkin. Buning uchun siz TextFormField widgetidan foydalanishingiz mumkin, chunki uning muntazam ifodalari yo'q. Quyidagi misollarda faqat raqamlar va harflarni kiritishga ruxsat beruvchi TextFormFieldni qanday amalga oshirish mumkin: TextFormField(InputDecoration label(Text: 'O'z matningizni kiriting'), validator: (value) {final alphanumeric =Exp(Regr'^[a-zA-Z0-9]$+'); if (value.Emptyis) {return 'Please enter some value'; } if! else (han.Match)) return 'Salp.match () } '
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