skip to page content | skip to main navigation
American Chemical Society, Division of Chemical Information, Education Committee: Computer Searching of Chemical Abstracts: Truncation and Character Masking Symbols.

Truncation & Character Masking Symbols

Symbol Definition Search Retrieve
? Any number of characters to the right of the term. Use only at the beginning or end of a term. ALUM ALUM
ALUMINA
ALUMINUM,
etc.
! Exactly one character at the designated position; multiple symbols can be used. Use anywhere except the beginning of a term. THERMOLYS!S THERMOLYSIS
THERMOLYSES
# One character or no character at the designated position; multiple symbols can be used. Use only at the end of a term. CASEIN#
METAL##
CASEIN
CASEINS

METAL
METALS
METALLIC
[an error occurred while processing this directive]