regular expressions in python sequence description example \ returns match if the following characters are at the beginning of the string returns match where the specified characters are at the beginning or at the end of word "\athemust start with 'the\ \ \ \ \ \ \ \ \ indicates that the following characters must be present in string but not at the start (or at the endof word returns match where the string contains digits (numbers from - returns match where the string does not contain digits returns match where the string contains white space character returns match where the string does not contain white space character returns match where the string contains any word characters (characters from to zdigits from - and the underscore characterreturns match where the string does not contain any word characters returns match if the following characters are present at the end of the string "\bonor "on\bindicates string must start or end with 'onr"\bonor "on\bmust not start or end with 'on"\ "\ "\ *"\ "\ "\ "hunt\zsets set is sequence of characters inside pair of square brackets which have specific meanings the following table provides some examples set description [jeh[ - [^zxc[ [ - [ - ][ - [ -za-zreturns match where one of the specified characters (je or hare present returns match for any lower-case characteralphabetically between and returns match for any character except zx and returns match where any of the specified digits ( or are present returns match for any digit between and returns match for any two-digit numbers from and returns match for any character alphabetically between and or and