| *Regexp pattern
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| Brackets | Brackets are used to find a range of characters:
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| [abc] | Find any character between the brackets
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| [^abc] | Find any character not between the brackets
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| [0-9] | Find any digit from 0 to 9
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| [A-Z] | Find any character from uppercase A to uppercase Z
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| [a-z] | Find any character from lowercase a to lowercase z
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| [A-z] | Find any character from uppercase A to lowercase z
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| [adgk] | Find any character in the given set
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| [^adgk] | Find any character outside the given set
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| (red|blue|green) | Find any of the alternatives specified
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| Metacharacters | Metacharacters are characters with a special meaning:
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| . | Find a single character, except newline or line terminator
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| \w | Find a word character
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| \W | Find a non-word character
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| \d | Find a digit
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| \D | Find a non-digit character
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| \s | Find a whitespace character
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| \S | Find a non-whitespace character
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| \b | Find a match at the beginning/end of a word
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| \B | Find a match not at the beginning/end of a word
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| \0 | Find a NUL character
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| \n | Find a new line character
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| \f | Find a form feed character
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| \r | Find a carriage return character
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| \t | Find a tab character
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| \v | Find a vertical tab character
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| \xxx | Find the character specified by an octal number xxx
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| \xdd | Find the character specified by a hexadecimal number dd
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| \uxxxx | Find the Unicode character specified by a hexadecimal number xxxx
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| Quantifiers |
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| n+ | Matches any string that contains at least one n
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| n* | Matches any string that contains zero or more occurrences of n
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| n? | Matches any string that contains zero or one occurrences of n
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| n{X} | Matches any string that contains a sequence of X n's
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| n{X,Y} | Matches any string that contains a sequence of X to Y n's
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| n{X,} | Matches any string that contains a sequence of at least X n's
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| n$ | Matches any string with n at the end of it
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| ^n | Matches any string with n at the beginning of it
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| ?=n | Matches any string that is followed by a specific string n
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| ?!n | Matches any string that is not followed by a specific string n
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