Spell checker

In computing terms, a spell checker or spelling checker is a design feature or a software program designed to verify the spelling of words in a document, helping a user to ensure correct spelling. A spell checker may be implemented as a stand-alone application capable of operating on an block of text; however, spelling checkers are more often implemented as a feature of a larger document-related application, such as a word processor or an email client.

Related Topics:
Computing - Software - Spelling - Word - Document - Application - Word processor - Email client

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Eye halve a spelling chequer,

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It came with my pea sea,

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It plainly marques four my revue

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Miss steaks eye kin knot sea.

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Eye strike a key and type a word

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And weight four it two say

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Weather eye am wrong oar write

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It shows me strait a weigh.

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As soon as a mist ache is maid

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It nose bee fore two long

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And eye can put the error rite

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Its rarely ever wrong.

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Eye have run this poem threw it

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I'm shore your pleased two no

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Its letter perfect in it's weigh,

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My chequer tolled me sew.

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An ordinary spelling checker will find little or no fault with this poem. This is because spelling checkers can only check if words are spelled correctly, not if the sentence makes sense.

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Spelling checkers operate by comparing each word in a given input against a vocabulary (often erroneously referred to as a dictionary). If the word is not found within the vocabulary, it is designated erroneous, and algorithms may be run to detect which word the user most likely meant to type. One simple such algorithm is listing words from the dictionary with a small Levenshtein distance from the typed word.

Related Topics:
Vocabulary - Dictionary - Levenshtein distance

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Spelling checkers can operate as the user enters text, notifying the user when an error is made (usually by underlining the erroneous text). They can also operate at the user's request, checking an entire document or email at once. A word processor will typically offer both modes of operation.

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Many spelling checkers can operate in more than one language. There are many cases in which a user may intentionally type a word which is not within the vocabulary of the language in which the spelling checker is operating; proper nouns and acronyms are two common examples. To solve this problem, most spelling checkers allow the user to add custom words to the spelling checker's vocabulary. Usually the user also has the option to ignore specific errors.

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