CHEMINFO
Title Bar

Truncation Symbols ("Wild Cards")

Use truncation symbols to allow for various word forms of your search terms.

Symbol Definition Example Retrieval
? Any number of characters
(including none), usually at the
end of a term*
STEROID? STEROID
STEROIDS
STEROIDAL
# One or zero characters,
at the end of a term
VAP#### VAPOR
VAPORS
VAPOUR
VAPOURS
! One character, at the end or within a term WOM!N WOMAN
WOMEN

* In the Basic Index of the CAplus file, truncation is allowed at the beginning of a term (?BACTERIA)

Reproduced with the permission of CAS, a Division of the American Chemical Society, from "Tips for Searching the CAplus & REGISTRY Files." (CAS9613-0298)