Regular Expression to allow Enter Key in MultiLine TextBox in ASP.Net

Question

SirI have Multiline textbox with regex for alphabet and max 300 char lengthShould allow line break in multiline textbox if user press enter key Below is my regex ltaspRegularExpressionValidator Display34Dynamic34 ID34RegularExpressionValidator1txtaddress34 ControlToValidate34txtaddress34 runat34server34 ErrorMessage34Only alphabet amp space allowed Max 300 chars34 ValidationGroup34reg34 CssClass34valmsg34 ValidationExpression34azAZ 130034gtltaspRegularExpressionValidatorgtHow should I do this

dharmendr · Accepted Answer

HiSumeetYou should add special character for new line into regex patternCheck this example Now please take its reference and correct your codeHTMLltaspTextBox runat34server34 ID34txtaddress34 TextMode34MultiLine34 gtltaspRegularExpressionValidator Display34Dynamic34 ID34RegularExpressionValidator1txtaddress34    ControlToValidate34txtaddress34 runat34server34 ErrorMessage34Only alphabet amp space allowed Max 300 chars34    ValidationGroup34reg34 CssClass34valmsg34 ValidationExpression34azAZ rn130034gtltaspRegularExpressionValidatorgtltaspButton Text34Save34 runat34server34 ValidationGroup34reg34 gtScreenshot