[5b-d] matches any chars '5', 'b', 'c' or 'd' [^a-c6] matches any char except 'a', 'b', 'c' or '6' {,1} is the same as using ? {0,} is the same as using * {1,} is the ...

abc] any character that isn’t between the brackets. Python’s regular expressions are greedy by default: in ambiguous situations they will match the longest string possible. The non-greedy version of ...

Logical grouping of part of an expression. * 0 or more of previous expression. + One or more of previous expression. ? 0 or 1 of previous expression; cũng your forces minimal matching when using an ...