• Your URL: local test server
  
• The browser used: FF 2.0
• cforms version: 7.53
• Your Wordpress version: 2.3.3

The double quote is printed directly and not converted via htmlspecialchars. This is not the case with the regexp value.

Data entered for single line of text:

Height|x' x"|^\d'\s*\d\d"$|err:Height must be in the form x' x".

Produced Source:

  <input type="text" name="cf_field_5" id="cf_field_5" class="single" value="x' x"" onfocus="clearField(this)" onblur="setField(this)"/>
  <input type="hidden" name="cf_field_5_regexp" id="cf_field_5_regexp" value="^\d'\s*\d\d&quot;$"/>