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Extract a substring from a string
 
String_Type substr (String_Type s, Integer_Type n, Integer_Type len) 
The substr function returns a substring with length len
of the string s beginning at position n.  If len is
-1, the entire length of the string s will be used for
len.  The first character of s is given by n equal
to 1.
 
     substr ("To be or not to be", 7, 5);
returns "or no"
 
In many cases it is more convenient to use array indexing rather
than the substr function.  In fact, substr(s,i+1,strlen(s)) is
equivalent to s[[i:]].
 
slangrtl
array_map,
bstrlen,
extract_element,
getenv,
init_char_array,
is_list_element,
is_substr,
length,
strlen,
strncmp,
strreplace,
strsub,
time
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