\Dany character that is not a Unicode decimal digit
\-the literal - (4510 / 558 / 2D16)
\d{1}a Unicode decimal digit, repeated exactly 1 time
\-the literal - (4510 / 558 / 2D16)
\d{1}a Unicode decimal digit, repeated exactly 1 time
\-the literal - (4510 / 558 / 2D16)
\d{2}a Unicode decimal digit, repeated exactly 2 times
\-the literal - (4510 / 558 / 2D16)
\d{10}a Unicode decimal digit, repeated exactly 10 times
\-the literal - (4510 / 558 / 2D16)
\d{10}a Unicode decimal digit, repeated exactly 10 times
\-the literal - (4510 / 558 / 2D16)
\d{9}a Unicode decimal digit, repeated exactly 9 times
\-the literal - (4510 / 558 / 2D16)
\d{4}a Unicode decimal digit, repeated exactly 4 times
Negative Lookahead(?!_Classes) _Classesthe literal text _Classes (case sensitive) g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string