Banish Zero Width Space
Zero width space (Wikipedia) is a Unicode character that has no character glyph and although they are part of the string they are visually impossible to detect and are persisted when copying text between any unicode aware tools.
They are commonly inserted in long strings with no spaces to allow the string to wordwrap and not overflow a text area. A common culprit is Solarwinds.
The presence of zero width space (ZWSP) can interfere with URLs, usernames and passwords.
This page allows you to paste a string and have it cleansed of Unicode 200B (HTML ​).
The above contains zero width characters!