case sensitivity

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Related to Case-sensitive: Case insensitive

case sensitivity

Whether a text matching operation distinguishes upper-case (capital) letters from lower case (is "case sensitive") or not ("case insensitive").

Case in file names should be preserved (for readability) but ignored when matching (so the user doesn't have to get it right). MS-DOS does not preserve case in file names, Unix preserves case and matches are case sensitive.

Any decent text editor will allow the user to specify whether or not text searches should be case sensitive.

Case sensitivity is also relevant in programming (most programming languages distiguish between case in the names of identifiers), and addressing (Internet domain names are case insensitive but RFC 822 local mailbox names are case sensitive).

Case insensitive operations are sometimes said to "fold case", from the idea of folding the character code table so that upper and lower case letters coincide. The alternative "smash case" is more likely to be used by someone who considers this behaviour a misfeature or in cases where one case is actually permanently converted to the other.

"MS-DOS will automatically smash case in the names of all the files you create".
This article is provided by FOLDOC - Free Online Dictionary of Computing (
References in periodicals archive ?
(90.) "For Single Seasons, From 1871 to 2018, From Age 16 to 19, sorted by greatest number of players matching criteria in a single season," accessed February 16, 2019, oNjtV (case-sensitive).
So ask yourself if your company would benefit from a case-sensitive credit policy.
While programming, it should also be remembered that Visual Basic is not case-sensitive while C# is a case-sensitive language [2, 3, 7].
Follow the case-sensitive link at to find all of the city's offerings under its "Outdoor" heading.
(Because FIND can search for a character or a string, if the data had a space after the comma, you could use "," as the first argument to get the same result.) Note that FIND is only for case-sensitive text comparisons; wildcard comparisons aren't supported.
Type that short code (which is case-sensitive) into your computer's Web browser (such as Internet Explorer or Firefox), and you'll be whisked away to the article or resource we want to share with you, without having to type in the full Web address (which, in this example, is World-Economy-Collapse-Overfishing.aspx).
This has resulted in complex alphanumeric, case-sensitive passwords that have to be periodically changed, which makes them hard to remember.
Designed to run on Mac or Windows, it has a fully customizable interface that offers users a wide range of advanced search options and unique features: enable/ disable case-sensitive searching; limit searches by the date of a word's first recorded use; search definitions, etymologies, subject, geographical region, or source language; listen to pronunciations for more than 100,000 words; cross-reference any words in the dictionary with a single mouse click; install the dictionary to the hard disk and run it without the CD-ROM; and crossword puzzle and anagram solvers.
It is not case-sensitive nor is it diacritic-sensitive.
That address is incorrect because the address to the ozone depleting substances site is case-sensitive. Use instead:
This volume is a quick, case-sensitive nursing reference covering approximately 200 common treatments.
Interested parties can download the file by visiting entering the username "institute" and password "Appraisal," both of which are case-sensitive. Since the recording is a large file, it may take a few moments for it to start, depending on the connection speed.