The significance of whole word with extension

[nagan]

Supppose I search for extension .avi or .txt and then press ctrl B (whole word modifier) , the number of objects come down drastically. I am unable to read the reason looking at the files. Would there be a particular logic to it? Case modifier makes a distinction between .txt and .TXT. But the whole word I do not understand...

[void]

With whole word enabled, your search must exist between word breaks (characters like spaces and punctuation).

for example, the whole word search ABC will match:

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(ABC)

Note the word breaks ( and )

But will not match:

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12ABC34

When you include a . in your search that too must exist within word breaks.
The . itself is not treated as a word break.
For example, the whole word search .txt will match:

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[ABC].txt

Note the ] is a word break.

The following will not match:

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ABC.txt

However, you have found a bug when match diacritics is disabled.
This will sometimes match even though there there was no word break.
Thanks for pointing this out.

Please check your results by enabling match diacritics.