I am absolutely clueless when it comes to Regex strings. I am trying to create a custom validator on a model using [RegularExpression("myValidator")] How can I create a regex expression to validate the following formats

• ######-##
• ######-#

where # is a number. Could someone help me out?

Thanks!

CodePudding user response：

• \d means digit.
• {N} means previous symbol repeated N times

so, basically you want:

\d{6}-\d{2}

which would match 6 digits, a dash, and 2 more digits.

You can also do:

\d{6}-\d{1,2}

which would match 6 digits, a dash, and then 1 or 2 more digits, and therefore work for either format you described.

Note: Those answers that have ^ and $ in them are referring to start-of-line and end-of-line. But your question did not include any instructions about the format only being found on a line by itself.

I would not rely on those answers.

CodePudding user response：

^\d{6}-\d{2}$ and ^\d{6}-\d{1}$