This is a pattern for "negative lookbehind". For example, (?<=B)A means that IntelliJ IDEA will search for A, but only if there is B before it. This is a pattern for "positive lookbehind". For example, A(?=B) means that IntelliJ IDEA will search for A, but match if only followed by B. This is a pattern for "positive lookahead". For example, A(?!B) means that IntelliJ IDEA will search for A, but only if not followed by B. This is a pattern for "negative lookahead". Use this type of regex in the replace field.
Use this type of regex in the replace field.Ĭhanges the case of all the subsequent characters up to \E to the upper case.
Use this type of regex in the replace field.Ĭhanges the case of all the subsequent characters up to \E to the lower case. Use this type of regex in the replace field.Ĭhanges the case of the next character to the upper case. This regex entered in the search field, means that you are trying to find a \ character at the end of the line.Ĭhanges the case of the next character to the lower case. \x041 is equivalent to \x04& 1.Īllows ASCII codes to be used in regular expressions. Hexadecimal escape values must be exactly two digits long.įor example, \x41 matches A. Matches n, where n is a hexadecimal escape value. Allows ASCII codes to be used in regular expressions. If they do, only the first two digits comprise the expression. Octal escape values should not exceed 256. Octal escape values should be 1, 2, or 3 digits long.įor example, \11 and \011 both match a tab character. Matches n, where n is an octal escape value. Matches num, where num is a positive integer, denoting a reference back to remembered matches.įor example, (.)\1 matches two consecutive identical characters. Matches any word character including underscore. Matches any white space including space, tab, form-feed, and so on. For example, er\b matches the er in never but not the er in verb. Matches a word boundary, that is, the position between a word and a space. For example, matches any character not in the range m through z. Matches any character not in the specified range. For example, "" matches any lowercase alphabetic character in the range a through z.Ī negative range characters. Matches any character in the specified range. For example, matches the p in plain.Ī range of characters. For example, matches the a in plain.Ī negative character set. Matches any one of the enclosed characters. For example, o is equivalent to o?.Ī character set. If you need to include the parentheses characters into a subexpression, use \( or \). If you need to refer the matched substring somewhere outside the current regular expression (for example, in another regular expression as a replacement string), you can retrieve it using the dollar sign $num, where num = 1.n. If you need to use the matched substring within the same regular expression, you can retrieve it using the backreference \num, where num = 1.n. Thus a regex operator can be applied to the entire group. If a part of a regular expression is enclosed in parentheses, that part of the regular expression is grouped together. Matches subexpression and remembers the match. Matches any single character except a newline character. For example, a?ve? matches the ve in never. Matches the preceding character zero or one time. For example, "zo+" matches zoo but not z. Matches the preceding character one or more times.
For example, "zo*" matches either z or zoo. Matches the preceding character zero or more times. The sequence \\ matches \ and \( matches (. Marks the next character as either a special character or a literal.
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