The trouble is that exact text search is rather restrictive.
The most annoying restriction is case-sensitivity: suppose you want to find “computer hardware”
,and there is a sentence in the document that begins with “Computer hardware”
Your search query does not exactly match the text in the sentence,because the first letter of the sentence is capitalized.
Fortunately, most word processors have an option for ignoring case during searches.
You can think of this as a very rudimentary form of online text processing.
Link most text processing techniques,
, ignoring case increases the probability that you will find a match for your query in the document.
Many search engines do not distinguish between uppercase and lowercase letters.