How to add multiline option on RegularExpression attribute?

Question

I am using:

[RegularExpression(@\"^(\"\"|\\[)?[a-zA-Z0-9\']{1,125}(\"\"|\\])?$\")]

to make sure each line of a multiline textbox is properl

Answer 1

This is how you would do it with Regex, basically not relying on multiline flag or attribute, instead you explicitly define the regex to allow new lines but the same pattern needs to follow

[RegularExpression(@"^(""|\[)?[a-zA-Z0-9']{1,125}(""|\])?(?:\r?\n(""|\[)?[a-zA-Z0-9']{1,125}(""|\])?)*$")]