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The word is mandatory in all rows returned (e.g. +oceanic) |
| - |
The word cannot appear in any row returned (e.g. -draft to exclude matches containing 'draft') |
| * | The wildcard, indicating zero or more characters. It can only appear at the end of a word (e.g. fish* would match 'fish', 'fishing', 'fisherman', etc.) |
| " |
Anything enclosed in the double quotes is taken as a whole (e.g "sea survey" would match a record called 'international sea survey by GOOS', but not 'sea salinity and temperature survey') |
| () | Used to group words into subexpressions |