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NameConventional designationUsage example
Any character*"c"*"t" – allows such words as cat, cot, etc.
LetterCC"ot" – allows such words as Rot, pot, cot, Dot, mot, etc.
Uppercase letterAA"ot" – allows such words as Rot, Cot, Mot, Dot, etc.
Lowercase letteraa"ot" – allows such words as rot, cot, mot, dot, etc.
Letter or numberXX – allows any standalone number or letter.
NumberNN"th" allows such words as 5th, 4th, 6th, etc.
String" ""cot"
Or|"pl"("o"|"a")"t" – allows words “plot” and “plat”.
Character from group[][tm]"ot" – allows words “tot” and “mot”.
Character not from group[^][^t]"ot" – allows words “cot”, “lot”, etc., but does not allow the word “tot”.
Space (within group)\s[A\s] allows only the letter A or a space.
Any number of repetitions (applies to the expression or subexpression on the left){-}[AB74]{-} – allows any combinations of characters A, B, 7, 4 of any length.
Number of repetitions n{n}N{2}"th" allows such words as 25th, 84th, 11th, etc.
From n to m repetitions{n-m}N{1-3}"th" allows such words as 5th, 84th, 111th, etc.
From 0 to n repetitions{-n}N{-2}"th" allows such words as 84th, 5th, etc.
From n repetitions and more{n-}N{2-}"th" allows such words as 25th, 834th, 311th, 34576th, etc.
Subexpression()
Hyphen symbol[\-]
Slash symbol[\\]

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Examples of regular expressions

  1. Postal code: [0-9]{6} An sample value: “142172”
  2. Zip code (USA): [0-9]{5}("-"[0-9]{4}){-1} Sample values: “55416”, “33701-4313”
  3. Income: N{4-8}[,]N{2} Sample values: “15000,00”, “4499,00”
  4. Month in the numerical form: ((|"0")[1-9])|("10")|("11")|("12") Sample values: “4”, “05”, “12”
  5. Fraction: ("-"|)([0-9]{1-})(|((".",")([0-9]{1-}))) Sample values: “1234,567”, “0.99”, “100,0”, “-345.6788903”
  6. E-mail: [A-Za-z0-9_]{1-}((".""-")[A-Za-z0-9_]{1-}){-3}"@"[A-Za-z0-9_]{1-}((".""-")[A-Za-z0-9_]{1-}){-4}"."([A-Za-z]{2-4}|"asia"|"museum"|"travel"|"example"|"localhost") Sample values: “support@abbyy.com”, “my-name@company.org.ru”, “info@gallery.museum”