Im really having a hard time in matches constraints in grails, im pretty new in it. what i wanted my field to only accept is an input with a format of a phone number, like 02-3546352 where (Area Code)-(Telephone Number). where other characters except numbers and dash are not accepted.Is it possible to filter my input like what i wanted to happen just using regex? please help. thanks for sharing your knowledge.
Assuming that that is the only pattern you want to match...
Something like this: ^\d{2}-\d{7}$ should match any string which starts (^) with any two digits (\d{2}) follow by a dash (-) and which is then followed by 7 digits (\d{7}) which is finally followed by the end of the string ($).
Take a look at this tutorial for more information.