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A regular expression (shortened as regex or regexp), [1] sometimes referred to as rational expression, [2] [3] is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings , or for input validation .
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 rendered contents of the page. To perform a regex search, use the ordinary search box with the syntax insource:/regex/ or intitle:/regex/.
A somewhat longer but more explicit extended right-regular grammar G for the same regular expression is given by N = {S, A, B, C}, Σ = {a, b, c}, where P consists of the following rules: S → A A → aA A → B B → bC C → ε C → cC...where each uppercase letter corresponds to phrases starting at the next position in the regular expression.
All other keyboard characters like punctuation marks, brackets and slashes, math and other symbols, are not normally searchable. By default Search will also stem the words and match them too. It automatically sorts results by the frequency and location of these, but also can boost page ranking by time, template usage, or even similarity to ...
Hebrew punctuation – Punctuation conventions of the Hebrew language over time; Glossary of mathematical symbols; Japanese punctuation; Korean punctuation; Ordinal indicator – Character(s) following an ordinal number (used of the style 1st, 2nd, 3rd, 4th or as superscript, 1 st, 2 nd, 3 rd, 4 th or (though not in English) 1º, 2º, 3º, 4º).
FLOWER PUNCTUATION MARK U+2055: Po, other Common ⁖ THREE DOT PUNCTUATION U+2056: Po, other Common ⁗ QUADRUPLE PRIME U+2057: Po, other Common ⁘ FOUR DOT PUNCTUATION U+2058: Po, other Common ⁙ FIVE DOT PUNCTUATION U+2059: Po, other Common ⁚ TWO DOT PUNCTUATION U+205A: Po, other Common ⁛ FOUR DOT MARK U+205B: Po, other Common ...
All other keyboard characters like punctuation marks, brackets and slashes, math and other symbols, are not normally searchable. By default Search will also stem the words and match them too. It automatically sorts results by the frequency and location of these, but also can boost page ranking by time, template usage, or even similarity to ...
P, Punctuation Pc: Punctuation, connector: Graphic: Character 10: Includes spacing underscore characters such as "_", and other spacing tie characters. Unlike other punctuation characters, these may be classified as "word" characters by regular expression libraries. [f] Pd: Punctuation, dash: Graphic: Character 27: Includes several hyphen ...