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Let’s take a look at how to do that with a text field that is only supposed to have a value of either ‘AAAA’ or ‘BBBB’ (yes, I know that this does not make much sense in a real PDF form).

So, if the user enters ‘01234’ we should see an error message that would instruct the user about what type of data is valid for this field.

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To start, we create a text field and bring up the properties dialog for the field.

Then we select the “Validate” tab to see the validation options: The default is that the field will not get validated.

In bash speak true means it exits with a zero status, anything else is false.

The status of a command/function is stored in the bash variable "$? variable so that rather than parsing words as whitespace separated items, bash parses them as dot separated.

64 bytes from icmp_seq=1 ttl=52 time=65.0 ms 64 bytes from icmp_seq=2 ttl=52 time=93.5 ms 64 bytes from icmp_seq=3 ttl=52 time=66.0 ms --- 66.240.62321 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2001ms rtt min/avg/max/mdev = 65.090/74.920/93.578/13.202 ms This does not handle IPv6 addresses which is a much more trickier gambit.

And a combination of IPv4/ IPv6 addresses would indeed make things interesting.

Another thing I like to do is to display the validation error message on the form in an otherwise hidden field: The problem with our last solution is that if the user saves a partially filled form, and picks it up at a later time, that error message that popped up is long gone, and the only indication that there is something wrong with the form is the modified field color.

So, having a text field contain that error message might be a good idea.

Which appears to indicate that you need to escape curly brackets for them to work, but that does not appear to be the case.

I think the problem may be that even though the above link appears as part of the I tried this with bash, since I wasn't aware that bash supported regular expressions, and it fell over when it encountered '=~', since it didn't know wnything about regular expressions. $ perl -MSocket -le'print inet_ntoa inet_aton q/ $ perl -MSocket -le'print unpack q/N/, inet_aton q/' 1123087217 $ ping 1123087217 PING 1123087217 ( 56(84) bytes of data.

Each of the four numbers has a valid range of 0 to 255.

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