A white space is a character. If it's invisible, it most probably is a white space.

I just went through the character map to get these. They are all in Calibri.

Number    Name                   HTML Code    Appearance
------    --------------------   ---------    ----------
U+2000    En Quad                       " "
U+2001    Em Quad                       " "
U+2002    En Space                      " "
U+2003    Em Space                      " "
U+2004    Three-Per-Em Space            " "
U+2005    Four-Per-Em Space             " "
U+2006    Six-Per-Em Space              " "
U+2007    Figure Space                  " "
U+2008    Punctuation Space             " "
U+2009    Thin Space                    " "
U+200A    Hair Space                    " "
U+200B    Zero-Width Space       ​      "​"
U+200C    Zero Width Non-Joiner  ‌      "‌"
U+200D    Zero Width Joiner      ‍      "‍"
U+200E    Left-To-Right Mark     ‎      "‎"
U+200F    Right-To-Left Mark     ‏      "‏"
U+202F    Narrow No-Break Space         " "

Hi @mwiegand Looking up this specific character, it falls into a class of unicode characters termed “Formatting”. I was recently investigating how to strip emoji and other characters from strings, and in the process discovered some quite useful info. In regex, there are a set of regex patterns describing unicode “classes” or “categories”. Once you know the class you wish to find or filter, you can then use these patterns. The pattern for this particular Formatting class is \p{Cf} , so if you replace your regex “SUCCESS” node to look for that class instead, you will find SUCCESS! :wink: [image] I had a go at putting together a component for filtering based on these classes, with some success. It can be found here, and is useful if the aim is simply to remove characters of particular classes. [image] String Emoji and Character Class Filter – takbb String Character Class and Emoji Filter Filter out emoji and other classes of characters from a string using a built in Regular Expression. This component can … (If the config screen for the component only initially has a small number of classes listed, try executing the component to “refresh” it. I probably need to fix something, but not quite sure where.) Some information about the different unicode categories, such as the “formatting” category can be found here: [image] Find all Unicode Characters from Hieroglyphs to Dingbats – Unicode Compart All Unicode Symbols with Names and Descriptions on One Page

There is a plugin for displaying whitespace and paragraph - Control Characters. It is done with CSS. It is possible to modify the code and use it as a CSS fragment. You may find these links helpful https://stackoverflow.com/questions/39508142/display-non-printable-characters-in-html-textarea https://stackoverflow.com/questions/869413/jquery-dialog-with-rounded-corners https://prostring.work/see-non-printable