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Yes. Without the actual character present to copy, you'd need to use some form of hex character code with regex to find it. In Sigil searching for \x{200D} would find a zero-width joiner character (hex code 0x200D).
x\{00AD} would find soft-hyphens
x\{202F} - narrow non-breaking space
x\{FEFF} - zero-width non-breaking space
Can't remember if calibre's regex engine uses the same notation or not. Could be something like u\{00AD} or u\00AD
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