Which two statements are true about Regular Expressions? (Choose two.)
A.
They are build upon expressions that match multiple characters.
B.
They can be used only by commands, not programming languages.
C.
They help most characters, letters, and numbers match themselves.
D.
They supports “<” and “>” at the beginning and end of sentences only.
E.
They accept text patterns from STDIN, from a network connection or from a user supplied input.