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There are other ways to highlight the field in question besides changing the text color, the border color or the fill color could be changed instead, or in addition, just make sure that you are not making the form impossible to read.

To learn more about the event object, take a look at JS.88.560– make sure to click on the button in the upper left corner to display the navigation pane if it’s not shown automatically.

While researching this I also ran across this statment here: Escaped "curly brackets" -- \ -- indicate the number of occurrences of a preceding RE to match.



I've recently written about using bash arrays and bash regular expressions, so here's a more useful example of using them to test IP addresses for validity.

To belabor the obvious: IP addresses are 32 bit values written as four numbers (the individual bytes of the IP address) separated by dots (periods).

This usage is technically not part of the basic RE set.

"[0-9]\" matches exactly five digits (characters in the range of 0 to 9).

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

The following bash script contains a bash function which returns true if it is passed a valid IP address and false otherwise.

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.

One of the questions I get asked again and again is how to validate a field value in an Acro Form with a custom validation script.

Adobe provided a lot of infrastructure to do that with just a simple script.

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.

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