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Description

\B matches a non (word boundary). A word boundary (\b) is defined as a spot between two characters that has a \w on one side of it and a \W on the other side of it (in either order).

Source

Ere iron was found or tree was hewn,    When young was mountain under moon; Ere ring was made, or wrought was woe,    It walked the forests long ago.

Case 1

Regular Expression: \B.
First match:Ere iron was found or tree was hewn, When young was mountain under moon; Ere ring was made, or wrought was woe, It walked the forests long ago.
All matches:Ere iron was found or tree was hewn, When young was mountain under moon; Ere ring was made, or wrought was woe, It walked the forests long ago.

Case 2

Regular Expression: .\B
First match:Ere iron was found or tree was hewn, When young was mountain under moon; Ere ring was made, or wrought was woe, It walked the forests long ago.
All matches:Ere iron was found or tree was hewn, When young was mountain under moon; Ere ring was made, or wrought was woe, It walked the forests long ago.