Rules for Valid Search Keywords

1. Characters ‘A’ - ‘Z’ (upper- or lowercase) and ‘0’ - ‘9’ are allowed, and any of those characters may be first.

2. The period (‘.’), ampersand (‘&’), apostrophe (‘'’), and hyphen (‘-’) characters will be accepted as long as they do not lead the text fragment. (e.g., “U.S.”, “T-BONDS”, “Platts”).

3. If the ampersand (‘&’) is used as part of a search keyword, then the entire keyword must be enclosed in double-quotes, as in “ "S&P" ”; otherwise, the ‘&’ will be interpreted as an ‘AND’ query operator in a complex search query.

4. A minimum of two significant characters are required. The exact-match suffix (‘!’), described earlier, does not count as part of the search keyword. Therefore, “TX” or “TX!” is acceptable, but not “T!”. The period (‘.’), apostrophe (‘'’), and hyphen (‘-’) characters also do not count as significant for this requirement.

5. Space characters are not allowed in keywords, even if the keyword is within quotation marks.