Browsing Sinhalese translation

Translators: this is a regular expression that is intended to match
a positive 'yes' response from a user at the command line.  The expression
as given means - does it begin with (that's the '^' character) any of
the characters in the '[' ']'?  In this case, we've chosen 'Y', 'y', and
'1' to mean positive answers, so any string beginning with 'Y', 'y', or
'1' will match.  For an example of translation, assume your language has
the words 'posolutely' and 'absitively' as common words that mean the
equivalent of 'yes'.  You might make the expression match the upper and
lower case forms: "^[aApP1]".  If the 'yes' and 'no' words for your
locale begin with the same character, the regular expression should be
modified to use words.  For example: "^(yes|Yes)" (note the change from
using '[' and ']' to '(' and ')').

Finally, this expression should match what you've chosen for the
translation of the "Enter y or n:" strings for this file.