Regular Expressions for Validations
^[0-9]$ it allows only numbers without any limit
^[0-9]{0,10}$ it allows only numbers up-to minimum 0 to maximum 10 digits
^[0-9]{1,10}$ it allows only numbers up-to minimum 1 to maximum 10 digits
^[0-9.]{0,10}$ it allows only numbers and decimal numbers also up-to minimum 1 to maximum 10 digits
^[+]?\\d+(\\.{0,1}(\\d{0,3})\\%{0,1})?$ it allows +ve numbers only and also
^ allows(caret)
[] specific numbers are symbols you want allow like [0-9] it allows 0 to 9 all numbers
{} specific limit for # chars appears in string {Min,Max}={0,1} means in given String # may appears once or not appears
\\ this like OR condition
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