{1}repeats the group contents below exactly 1 time:
\da digit
\ta tab character (ASCII 9)
\ta tab character (ASCII 9)
{1,3}repeats the group contents below between 1 and 3 times:
\da digit
\%the literal % (3710 / 458 / 2516)
\sany whitespace character
\ta tab character (ASCII 9)
{1}repeats the group contents below exactly 1 time:
\da digit
\ta tab character (ASCII 9)
{1,3}repeats the group contents below between 1 and 3 times:
\da digit
\%the literal % (3710 / 458 / 2516)
g modifier: global. Finds all matches instead of stopping after the first