functions
Names of function that match a given regular expression.
(flist)=functions(regex)
Inputs
regex A regular expression.
Outputs
flist The array of names of functions that match the input, or null if none is found.


Description
The letter * in the input is matched with one or more characters that are allowed in the name of a function. The letter ? matches one or no characters.
Example
>>functions("*sin*")
  asin
  isinfinity
  isinteger
  sin
>>functions("?sin?")
  asin
  sin