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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 .
sed scripts can have comments (the line starting with the # symbol). The s (substitute) command is the most important sed command. sed allows simple programming, with commands such as q (quit). sed uses regular expressions, such as .* (zero or more of any character).
Sed regular expressions, particularly those using the "s" operator, are much similar to Perl (sed is a predecessor to Perl). The default delimiter is "/", but any delimiter can be used; the default is s / regexp / replacement /, but s: regexp: replacement: is also a valid form. For example, to match a "pub" directory (as in the Perl example ...
grep is a command-line utility for searching plaintext datasets for lines that match a regular expression.Its name comes from the ed command g/re/p (global regular expression search and print), which has the same effect.
Regular Expression Flavor Comparison – Detailed comparison of the most popular regular expression flavors; Regexp Syntax Summary; Online Regular Expression Testing – with support for Java, JavaScript, .Net, PHP, Python and Ruby; Implementing Regular Expressions – series of articles by Russ Cox, author of RE2; Regular Expression Engines
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When using AWB, you can refresh the typo list by selecting "File → Refresh status/typos" (CTRL-R). This is useful when you are modifying the typo list on Wikipedia while using AWB to test/process the modification (but basic testing should first be done offline—e.g. by using AWB's Regex Tester or "Find and replace").
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