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    <p>Fields are validated and/or formatted according to their <code>AA</code> (additional actions) entry, which practically is JavaScript function call. Unfortunately, <code>pdftk</code> ignores this entry and doesn't export it neither to FDF (<code>generate_fdf</code>) nor text (<code>dump_data_fields</code>). Messing with <code>pdftk</code>'s source is above my abilities. If you won't find any ready-made solution that extracts this kind of information from PDF form, you can write a small program using API that either provides access to all field's properties or low level COS structure. E.g.</p> <pre><code>$ perl -Mstrict -MCAM::PDF -we ' my $doc = CAM::PDF-&gt;new($ARGV[0]) or die(); for ($doc-&gt;getFormFieldList()) { my $field = $doc-&gt;getFormField($_); next unless defined $field; my $dict = $doc-&gt;getValue($field); next unless exists $$dict{FT} and $doc-&gt;getValue($$dict{FT}) eq "Tx"; print "Field \"$_\" "; my $AA = $doc-&gt;getValue($$dict{AA}); my $F = $doc-&gt;getValue($$AA{F}); my $JS = $doc-&gt;getValue($$F{JS}); print $JS ? "is formatted as \"$JS\"\n" : "is a plain text\n"; } ' MIVoterRegistration_97046_7.pdf </code></pre> <p>Sorry for example PDF :-), that's the first quick google result that, I checked, <em>does</em> contain <code>AA</code>s. And output is</p> <pre><code>Field "LastName" is a plain text Field "FirstName" is a plain text Field "Middle Name" is a plain text Field "Address" is a plain text Field "Apart#" is a plain text Field "City" is a plain text Field "ZipCode" is a plain text Field "Telephone" is formatted as "AFSpecial_Format(2);" Field "describe" is a plain text Field "c/t" is a plain text Field "County" is a plain text Field "School" is a plain text Field "MailAddress" is a plain text Field "DOB" is a plain text Field "DLNumber" is a plain text Field "DLState" is a plain text Field "SSNumber" is a plain text Field "PrevAddress" is a plain text Field "PrevC/T" is a plain text Field "PrevCounty" is a plain text Field "PrevState" is a plain text Field "PrevZipCode" is a plain text Field "PrevName" is a plain text </code></pre> <p>Functions, that define field format, are described <a href="http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/FormsAPIReference.pdf" rel="nofollow">here</a>, and <code>AFSpecial_Format(2)</code> is indeed phone number format. Curiously, it looks like all other form's fields were thought unimportant by form's creators :-).</p>
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    1. POHow to get the format category (datatype) of a text field in a pdf with pdftk?
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    1. COThank you for the info. I'll check it out and let you let you know if I am able to get everything to work.
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