Explanation A way of expressing a text pattern for matching purposes what is: regular expression A regular expression is a way of expressing a text pattern for the purpose of matching a string. Regular expressions are often used either to extract information from a string or to verify that a string is of the correct format. When referred to, regular expressions are often abbreviated to simply "regex". The following are examples of regular expressions: Regex Meaning . A dot matches any single character. c.t Matches "cat", "cbt" ... "c1t" ... "c&t" etc (with anything before the "c" and anything after the "t"). [0-9] Matches any single character in the range 0 to 9. [09] Matches the single character 0 or 9 (but not 1 to 8). This can be useful if you don't know the case of something, because [aA] will match either a or A. [0-9a-zA-Z] Matches any single character in the range 0 to 9 or a to z or A to Z. ? Matches any single character. * Matches the preceding element zero or more times. a[0-9]*z Will match against "az", "a1z" ... "a999z" etc. + Matches the preceding element one or more times. a[0-9]+z Will match against "a1z" ... "a999z" etc (but not "az"). {number} Matches the preceding element the specified number of times. a[0-1]{2}z Will match against "a00z", "a10z", "a01z" and "a11z". {min,max} Matches the preceding element a minimum of "min" times at at most "max" times. a[0-1]{1,2}z Will match against "a0z", "a1z", "a00z", "a10z", "a01z" and "a11z". [^...] Inverts a match - matches anything except. a[^0-1]z Will match against any three letter string starting with "a", ending with "z" that is not "a0z" or "a1z". ^ Matches at the start of the line. $ Matches at the end of the line. Escape character. Allows the following character to be treated as a literal rather than having a special meaning, thus + matches against + rather than + having its normal meaning. A Matches at the start of the string. When dealing with a single line expression A is equivalent to ^. Z Matches at the end of the string. When dealing with single line expressions Z is equivalent to $. xNN Will match against the single character with the hex code 'NN'. So
- Define A Technique Used By Spammers To Use Email Non-Delivery Reports To Deliver Spam:
- Use technique used by spammers to use email non-delivery reports (NDRs) to deliver spam. Reverse NDR is sometimes abbreviated to simply RNDR. EMail servers are often configured to delivery a non-delivery a way of expressing a text pattern for matching purposes definition.
- Define A Form Of Harassment:
- Use Trolling A form of harassment that can take over a discussion. See also: Troll a way of expressing a text pattern for matching purposes explain.
- Define A Web Scripting Language:
- Use Python A web scripting language. Python is an open source object oriented programming language.Relevant links: www.python.org - Python programming language official website a way of expressing a text pattern for matching purposes what is.
- Define Application Centre Test:
- Use ACT Microsoft Application Center Test. Part of Microsoft Visual Studio .NET a way of expressing a text pattern for matching purposes meaning.
- Define An Index Mapping Words To Their Locations Within Documents:
- Use Index A type of Inverted Index where each index provides a mapping from words to the documents that contain them and the locations of each occurrence of the word within those documents. cf Inverted a way of expressing a text pattern for matching purposes abbreviation.
