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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/.
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 ...
Punctuation: Separator, space Figure space. In fonts with monospaced digits, equal to the width of one digit. HTML/XML named entity:   punctuation space: U+2008: 8200 Yes: No Common: General Punctuation: Separator, space As wide as the narrow punctuation in a font, i.e. the advance width of the period or comma. [2] HTML/XML named entity ...
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 ...
The primary regex crate does not allow look-around expressions. There is an Oniguruma binding called onig that does. SAP ABAP: SAP.com: Proprietary: Tcl: tcl.tk: Tcl/Tk License (BSD-style) Tcl library doubles as a regular expression library. Wolfram Language: Wolfram Research: Proprietary: usable for free on a limited scale on the Wolfram ...
Perl Compatible Regular Expressions (PCRE) is a library written in C, which implements a regular expression engine, inspired by the capabilities of the Perl programming language. Philip Hazel started writing PCRE in summer 1997. [ 3 ]
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).