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I could not find any practical way to do this, myself:
APPLE should be matched
APPLE APPLE should result in two matches
APPLE (APPLE) should result in one match
(BANANA APPLE) should result in no matches
()APPLE() should result in one match
The brackets can be separated from the wanted string by any length of text over multiple lines. Other brackets not containing the string can exist in any configuration.
EDIT None of the answers thus far (and thanks for them!) allow for newline characters between the brackets. Is this not a possibility?
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[] denotes a character class. () denotes a capturing group. [a-z0-9] -- One character that is in the range of a-z OR 0-9.
Regular expressions can't count brackets.
For examples, \+ matches "+" ; \[ matches "[" ; and \. matches "." . Regex also recognizes common escape sequences such as \n for newline, \t for tab, \r for carriage-return, \nnn for a up to 3-digit octal number, \xhh for a two-digit hex code, \uhhhh for a 4-digit Unicode, \uhhhhhhhh for a 8-digit Unicode.
Since parentheses are also used for capturing and non-capturing groups, we have to escape the opening parenthesis with a backslash. An explanation of how literalRegex works: / — Opens or begins regex.
Hope this will work fine
Regex: (?<!\()\bAPPLE\b(?![\w\s]*[\)])
\b a word boundary
(?![\w\s]*[\)]) Negatively lookahead for ) followed by words or spaces
(?<!\() Negatively lookbehind for (
RegexDemo
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