Pyparsing: the differences between MatchFirst, Or, and oneOf -

Pyparsing: the differences between MatchFirst, Or, and oneOf -

in pyparsing, differences between matchfirst, or, , oneof

when there shared characters in strings like

word, wording, words

or(['word', 'wording', 'words'])

matchfirst(['word', 'wording', 'words'])

oneof(['word', 'wording', 'words'])

from online docs (https://pythonhosted.org/pyparsing/)

matchfirst - if 2 expressions match, first 1 listed 1 match.

or - if 2 expressions match, look matches longest string used.

oneof - helper define set of alternative literals, , makes sure longest-first testing when there conflict, regardless of input order, returns matchfirst best performance.

matchfirst tests current parse location each string in constructor, stopping @ first 1 match.

or tests current parse location against of strings given in constructor, , homecoming longest match.

oneof generates regex or matchfirst match longest match, reordering input list when there alternatives mutual start strings test longer string first.

pyparsing