replace_chars f s creates a new string where all characters c from s have been replaced by the result of f c

reverse s creates a new reversed version of s

filter p s creates a copy of s containing the characters of s such that p c = true,

lfindi s p retrieves the first index of a character verifying predicate p. None otherwise

remove_char c s creates a copy of s without any occurrence of c

remove_newline s creates a copy of s without the newline character '\n'

lchop n s removes the first n characters of string s. Does nothing if the s is empty. Returns the empty string if n >= String.length s n must be positive.

left n s returns the n leftmost characters of s. n must be positive and smaller than the length of s.

right n s returns the n rightmost characters of s. n must be positive and smaller than the length of s.

size_of_hexstring s computes the size in bits of hexadecimal string s. Unsafe function: it does not fully check that s is a valid hexstring.

contains ~pattern s return true if pattern is a substring of s

is_char_printable c returns true if c is a terminal-printable ASCII character

is_hex_char c returns true if c is a character representing a hex number, i.e., 'a'-'z', 'A'-'Z', '0'-'9'.

to_hex s return the hexadecimal representation of stored bytes

pp_hex s print the hexadecimal representation of stored bytes