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A match is made, not when all the atoms of the string are matched, but rather when all the pattern atoms in the regex have matched. The idea is to make a small pattern of characters stand for a large number of possible strings, rather than compiling a large list of all the literal possibilities.
Raku rules are the regular expression, string matching and general-purpose parsing facility of the Raku programming language, and are a core part of the language. Since Perl's pattern-matching constructs have exceeded the capabilities of formal regular expressions for some time, Raku documentation refers to them exclusively as regexes, distancing the term from the formal definition.
is the character immediately following space, and "" is U+10FFFF, the last character in Unicode. Thus, the range from " " to "" includes all characters except for control characters (of which articles may contain newlines and tabulation), while the range from "!" to "" includes all characters except for control characters and space.
Using whitespace characters to layout text is a convention. Applications sometimes render whitespace characters as visible markup so that a user can see what is normally not visible. Typically, a user types a space character by pressing spacebar, a tab character by pressing Tab ↹ and newline by pressing ↵ Enter.
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.
Causes whitespace characters (spaces, tabs, and newlines) in the pattern to be ignored, so that they can be used to keep the pattern visually organized. [ a ] ^ To match whitespace characters while the IgnorePatternWhitespace option is enabled, they must be identified with character classes, i.e. \s (whitespace), \n (newline), or \t (tab).
Regular expressions (or regex) are a common and very versatile programming technique for manipulating strings. On Wikipedia you can use a limited version of regex called a Lua pattern to select and modify bits of text from a string. The pattern is a piece of code describing what you are looking for in the string.
We use the term grey-space instead of whitespace here to include the space character itself and all these characters. Multiple [grey-]spaces are equivalent to a single space. Grey-space is ignored between the words of exact-phrase searches, between adjacent items in the query, and in starting characters of the search box query. All filters can ...