Returns the integer represented by the given string or None if the string does not represent an integer.

Returns the float represented by the given string or None if the string does not represent a float.

index s c returns Some p, the position of the leftmost occurrence of character c in string s or None if c does not occur in s.

rindex s c returns Some p, the position of the rightmost occurrence of character c in string s or None if c does not occur in s.

Same as String.Exceptionless.index, but start searching at the character position given as second argument. index s c is equivalent to index_from s 0 c.

Same as String.Exceptionless.rindex, but start searching at the character position given as second argument. rindex s c is equivalent to rindex_from s (String.length s - 1) c.

find s x returns Some i, the starting index of the first occurrence of string x within string s, or None if x is not a substring of s.

Note This implementation is optimized for short strings.

find_from s ofs x behaves as find s x but starts searching at offset ofs. find s x is equivalent to find_from s 0 x.

rfind s x returns Some i, the starting index of the last occurrence of string x within string s, or None if x is not a substring of s.

Note This implementation is optimized for short strings.

rfind_from s ofs x behaves as rfind s x but starts searching at offset ofs. rfind s x is equivalent to rfind_from s (String.length s - 1) x.

split s sep splits the string s between the first occurrence of sep, or returns None if the separator is not found.

rsplit s sep splits the string s between the last occurrence of sep, or returns None if the separator is not found.