Sample Code:
String num = '(123) 456-7894';
system.debug( num.replaceAll( '[^0-9]', '' ) ); Debug Log:
How to remove all the formats from Phone Number in Salesforce?
Sample Code:
String num = '(123) 456-7894';
system.debug( num.replaceAll( '[^0-9]', '' ) ); Debug Log: