Concatenation Two regular expressions may be concatenated; the resulting regular expression matches any string formed by concatenating two substrings that respectively match the concatenated expressions. Alternation Two regular expressions may be joined by the infix operator |; the resulting regular expression...
grep understands three different versions of regular expression syntax: “basic” (BRE), “extended” (ERE) and “perl” (PCRE). In GNU grep there is no difference in available functionality between basic and extended syntaxes. In other implementations, basic regular expressions are less powerful...
It is otherwise useful on terminals for which the back_color_erase (bce) boolean terminfo capability does not apply, when the chosen highlight colors do not affect the background, or when EL is too slow or causes too much flicker. The default is false (i.e., the capability is omitted)...
The grep command is a powerful command line tool in Linux used to search and filter out specific patterns or strings in a file, directory, or even in the output of other commands. You may be wondering about its unusual name; well it stands for “Global Regular Expression Print.” It was...
The pattern is a PCRE regular expression, and is matched against the final component of the directory name, not the entire path. The -F, -w, and -x options do not apply to this pattern. The option may be given any number of times in order to specify more than one pattern. If a ...
regex(5) doesn't say anything abt the implementation.[a-Z]can be interpreted in other ways too (see joe's comment)(122-65+1)= 58 != 26*2=> There are other chars you would be including IF someone implemented[a-Z]the way you wanted. ...
A regular expression is a pattern that describes a set of strings. Regular expressions are constructed analogously to arithmetic expressions, by using various operators to combine smaller expressions. grep understands three different versions of regular expression syntax: “basic” (BRE), “extended” ...
While we are here, I noticed that there is an "Latin Extended Additional" block that includes a lot of latin with diacritics. If we add those too we have: ([\x{0020}-\x{024F}\x{1E00}-\x{1EFF}\x{2100}-\x{214F}]+\s?)+ - Mark Votes 1 Upvote Translate Translate Report Re...
The pattern is a PCRE regular expression, and is matched against the final component of the name (not the entire path). If a subdirectory name matches both --include-dir and --exclude-dir, it is excluded. There is no short form for this option. -F, --fixed-strings Interpret each ...
a single screen, especially when searching a large file. You can pipe the resulting data stream through the less utility and then use the less search facility which implements regexes, too, to highlight the occurrences of matches to the search pattern. The search argument in less is:\<tar\...