Return a substring from a string using start and end as index values. If end is None, it will return the length to the end of the string from start. Negative numbers are permitted to designate distance from the end of the string.

Arguments:

def util.strings.substring(
  s: str = None,
  start: int, dec = 0,
  end: int, dec = None,
):

Returns a string.

Example:

s = "hello world"
util.strings.substring(s=s, end=5) # 'hello' 
util.strings.substring(s=s, start=6) # 'world'
util.strings.substring(s=s, start=1, end=5) # 'ello'
util.strings.substring(s=s, end=-6) # 'hello'
util.strings.substring(s=s, end=-999, end=-999) # ''