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|+||Required word – matches exactly 1 word-form
the + days matches
the old days, the good days, the bad days...
|~||Optional word – matches 0 or 1 word-form
the ~ days matches
the days, the old days, the good days, the bad days...
[~ matches 0 or 1 word-forms]
the ~ ~ days matches
the days, the old days, the good days, the good old days...
[~ ~ matches 0, 1 or 2 word forms]
For example, to match ____, enter...
- all 3-grams + + +
- 4-grams beginning with the only the only + +
- 3- or 4-grams beginning with the only the only + ~
|*|| 0 or more characters
nation, nations, national, nationalistic, nationalise...
|?||Exactly 1 character
sing, sang, sung, song...
Fetching explanation of Regular Expressions