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Any character except newline (Newline is included if singleline option is active; see #Regex behavior options below) \w Any "word" character (letters, digits, underscore)
A regex search scans the text of each page on Wikipedia in real time, character by character, to find pages that match a specific sequence or pattern of characters. Unlike keyword searching, regex searching is by default case-sensitive, does not ignore punctuation, and operates directly on the page source (MediaWiki markup) rather than on the ...
Matches any single character (many applications exclude newlines, and exactly which characters are considered newlines is flavor-, character-encoding-, and platform-specific, but it is safe to assume that the line feed character is included). Within POSIX bracket expressions, the dot character matches a literal dot.
Any mix of whitespace characters and these non-word characters, we may refer to as grey-space. Grey-space, then, is all non-word characters except the double quote character, which is not ignored. Grey-space is a string of one or more characters such as brackets and math symbols and punctuation and space.
A metacharacter is a character that has a special meaning to a computer program, such as a shell interpreter or a regular expression (regex) engine.. In POSIX extended regular expressions, there are 14 metacharacters that must be escaped — preceded by a backslash (\) — in order to drop their special meaning and be treated literally inside an expression: opening and closing square brackets ...
[a-xyz], [^a-xyz] character class (possibly negated). any character except newline; R \ S difference of character classes; R* zero or more occurrences of R; R+ one or more occurrences of R; R? zero or one occurrence of R; R{n} repetition of R exactly n times; R{n,} repetition of R at least n times; R{n,m} repetition of R from n to m times
Any mix of whitespace characters and these non-word characters, we may refer to as grey-space. Grey-space, then, is all non-word characters except the double quote character, which is not ignored. Grey-space is a string of one or more characters such as brackets and math symbols and punctuation and space.
Multiline – If checked, this indicates to AWB that the regex characters "^" and "$" so that they match at the beginning and the end of lines respectively, not just the beginning and end of a whole string. Single line – If checked, this indicates to AWB that the regex character "." matches every character. Instead of every character except "\n".