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{ // --- Back References --- // A back reference allows you to to reuse the expression // that proceeds it // Grab a double word std::string str1 = "The cat cat fell out the window"; // Match word boundary, 1 or more characters, space // and the same word that proceeded ...
\sReturns a match where the string contains a white space character"\s"Try it » \SReturns a match where the string DOES NOT contain a white space character"\S"Try it » \wReturns a match where the string contains any word characters (characters from a to Z, digits from 0-9, an...
A regular expression is just a pattern of characters that we use to perform a search in a text. For example, the regular expression the means: the letter t, followed by the letter h, followed by the letter e."the" => The fat cat sat on the mat. ...
[[:space:]] Whitespace ([\t\n\v\f\r ]) [[:upper:]] Upper case ([A-Z]) [[:word:]] Word characters ([0-9A-Za-z_]) [[:xdigit:]] Hex digit ([0-9A-Fa-f]) Performance This section provides some guidance on speed and resource usage of regex expressions. Unicode can affect...
Figure 8 CAtlRegExp Special Characters Abbrev.Matches \aAny alphanumeric character: ([a-zA-Z0-9]) \bWhite space (blank): ([ \\t]) \cAny alphabetic character: ([a-zA-Z]) \dAny decimal digit: ([0-9]) \hAny hexadecimal digit: ([0-9a-fA-F]) ...
of data as input and removes any non-alphanumeric characters using a regex pattern. The pattern r'[\W_]+’ matches one or more non-alphanumeric characters or underscores. The re.sub function substitutes matches of the pattern with a space character, effectively removing them from the string....
abbott matches the characters abbott literally (case insensitive) 6th Alternative abbvie abbvie matches the characters abbvie literally (case insensitive) 7th Alternative abc abc matches the characters abc literally (case insensitive) 8th Alternative able able matches the characters able literally (case ...
When theUNICODEflag is not specified, it matches any whitespace character, this is equivalent to the set[\t\n\r\f\v]. TheLOCALEflag has no extra effect on matching of the space. IfUNICODEis set, this will match the characters[\t\n\r\f\v]plus whatever is classified as space in the...
Search, filter and view user submitted regular expressions in the regex library. Over 20,000 entries, and counting!