Natural Language Processing: Regular Expressions
- /word/ - matches any string containing the substring "word". Note: it's case sensitive.
- /[ab]/ - disjunction of characters: "a" or" b"
- /cat|dog/ - disjunction of string cat and dog. To be read as: String containing "cat" or "dog"
- /pupp(y|ies)/ - To be read as: string containing "puppy" or "puppies"
- /[a-z]/ - shows an interval: any letter between "a" and "z"
- /[^a] / - "^" shows negation when it's the first character inside brackets. To be read as: not containing "a"
- /^The/ - Here "^" matches only the string which starts with the expression that follows it. E.g. The dog barks.
- /s.$/ - "$" matches the end of the line. E.g. expression that matches any string ending with .s
- /words?/ - "?" implies zero or one instances of the previous character. E.g. word or words
- /b.y/ - "." shows any character between b and y. E.g. for the expression "busy life", the answer would be "us"
- /a*/ - "*" shows any string of 0 or more "a"'s. To be read as: "String containing no a's or 1 ore more a's
- /[ab+] / - "+" shows 1 ore more occurences of the previous character. To be read as:Any character containing 1 ore more ab's.
- /\bthe \b/ / "\b" matches a word boundary. To be read as "matches a string which contains "the" isolated by other words. E.g. "in the club" but not "the other",
- \d - contains any digit
- \D - contains any non-digit
- {n} - n occurences of the previous char or expression
- {,n} - up to n occurences of the previous char or expresssion
- {n, m) - from n to m occurences of the previous char or expression
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Words consist of one or more morphemes (cats= cat+ s). A morpheme is the smallest unit of language.
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