The operands CHARS, PREFIX, SUFFIX, and WORD control the conditions for a successful match with the string based on whether the data string begins and/or ends with a non-alphanumeric character; that is, a special character or a blank. You can abbreviate PREFIX, SUFFIX, and CHARS to PRE, SUF, and CHAR, respectively.

In this example, the highlighted strings would be found and the strings that are not highlighted would be ignored:

CHARS 'DO'  - DO DONE ADO ADOPT 'DO' +ADO (DONE) ADO-

PREFIX 'DO' - DO DONE ADO ADOPT 'DO' +ADO (DONE) ADO-

SUFFIX 'DO' - DO DONE ADO ADOPT 'DO' +ADO (DONE) ADO-

WORD 'DO'   - DO DONE ADO ADOPT 'DO' +ADO (DONE) ADO-

If you do not specify an operand, the default is CHARS.