Allow only 20 alphabets and numbers in TextBox using regular expression.

Question

Hi I have TextBox and I want to add validation using regular expression. I want to allow only 20 alphabet or number in TextBox. Example [A-Za-z0-9]{120} Any idea about regular expression. - Thanks

Vulpes · Answer

\p{IsArabic} should match any Arabic character. So if you want to mix these in with English characters and spaces (subject to a maximum of 20 characters overall) I'd try: @^[\p{IsArabic}a-zA-Z\s]{120}$ or if you want to precede the (maximum 20) English characters and spaces by any number of Arabic characters (including 0): @^\p{IsArabic}*[a-zA-Z\s]{120}$

zohaib khan · Answer

Hi Vulpes Excellent many thanks. Zohaib.

zohaib khan · Answer

Hi Any idea about regular expression if I use English and Arabic with following @^[a-zA-Z\s]{120}$ I tried @^[?-?\s]*[a-zA-Z\s]{120}$ but not working Unicode Regular Expressions will help? http://www.regular-expressions.info/unicode.html#script - Thanks

zohaib khan · Answer

Thanks Valpes It is working :)

Vulpes · Answer

If you only want to allow extra spaces at the end use: string regExp = @^[a-zA-Z0-9]{120}\s*$; If you want to allow spaces anywhere within the string but limited overall to 20 characters use: string regExp = @^[a-zA-Z0-9\s]{120}$;

zohaib khan · Answer

Thanks for reply. it is working and if I want to allow spaces adding + sign not working. ^[A-Za-z]{120}+$ OR ^[A-Za-z\s]{120}$ I am getting exception regarding - Nested quantifier +.

Muralidharan Deenathayalan · Answer

Can you please try this ? [a-zA-Z0-9]{20} Online RegEx tester

Vulpes · Answer

Try the following regular expression: string regExp = ^[a-zA-Z0-9]{120}$;