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I'm new to APEX and was writing a validation function for a field called DESIGNATION. I have the REGEX that that looks like this:

(^[a-zA-Z0-9][a-zA-Z0-9=.\-\/\s+]{1,49})

The designation field must begin with an a-z, A-Z or 0-9 and be followed by 1 to 49 more characters that are a-z, A-Z, 0-9 an equal sign, a period, a hyphen, a backslash, or a space character. This field must be one character long and can be a total of 50 characters long.

Here is a screen shot of the validation screen:

Page Validation

When I go to run my app on the screen called SYNOPTIC with the designation field on it to validate and type "AZC A }{}##" which has the bad characters of '}{}##' in it, it allow the row to be updated and shouldn't

UI

So my question is, is it the regular expression that is the issue or the Type field being "Item/Column in Expression 1 matches Regular Expression in Expression 2", or a combination of both? If my regular expression is bad then how do I fix it?

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  • Just a note, field names cannot start with a number.
    – Adrian Larson
    Commented Apr 28, 2017 at 16:22

1 Answer 1

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The dot has a special meaning in regular expressions and so any character is valid. You need to escape the dot with a backslash for it to work. Moreover you stated that a backslash should be matched, but your expression would match a forward slash instead. To change this you need to replace \/ with \\. Altogether this leads to something like this:

(^[a-zA-Z0-9][a-zA-Z0-9=\.\-\\\s+]{1,49})

A good resource to test regular expressions that also gives a detailed explanation of the current meaning of the expression is regular expressions 101

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  • Thanks for the link, Markus. Well, I even reduced my expression down to ([A-Z,0-9]{1,50}) and it still allows bad characters such as #${} into my designation field. I think that it is an issue with getting the right Type and the right Condition Type field to sync up with my regex. I have a Type of "Item/Column in Expression 1 matches Regular Expression in Expression 2", and a Condition Type of "Always" set for whenever the SUBMIT (Save Changes) button is pressed. So my question now becomes, do I have the right settings for my regex?
    – Janet
    Commented May 1, 2017 at 13:24

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