Standard SQL vs Legacy SQL - functions

Standard SQL	Legacy SQL
#standardSQL SELECT  repository.url FROM  `bigquery-public-data.samples.github_nested` LIMIT 5;	#legacySQL SELECT   repository.url FROM [bigquery-public-data.samples.github_nested] LIMIT 5;
Numeric
SAFE_CAST(x AS INT64)	INTEGER(x)
SAFE_CAST(x AS INT64)	CAST(x AS INTEGER)
APPROX_COUNT_DISTINCT(x)	COUNT(DISTINCT x)
COUNT(DISTINCT x)	EXACT_COUNT_DISTINCT(x)
APPROX_QUANTILES(x, buckets)	QUANTILES(x, buckets + 1)
APPROX_TOP_COUNT(x, num)	TOP(x, num), COUNT(*)
MOD(x, y)	x % y
Datetime
TIMESTAMP_DIFF(t1, t2, DAY)	DATEDIFF(t1, t2)
CURRENT_TIMESTAMP	NOW
FORMAT_TIMESTAMP(fmt, t)	STRFTIME_UTC_USEC(t, fmt)
TIMESTAMP_TRUNC(t, DAY)	UTC_USEC_TO_DAY(t)
REGEXP_CONTAINS(s, pattern)	REGEXP_MATCH(s, pattern)
x IS NULL	IS_NULL(x)
Strings
SAFE_CAST(x AS STRING)	STRING(x)
SAFE_CAST(x AS STRING)	CAST(x AS STRING)
SUBSTR(s, 0, len)	LEFT(s, len)
SUBSTR(s, -len)	RIGHT(s, len)
STRPOS(s, "abc") > 0 or s LIKE '%abc%'	s CONTAINS "abc"
STRING_AGG(s, sep)	GROUP_CONCAT_UNQUOTED(s, sep)
IFNULL(LOGICAL_OR(x), false)	SOME(x)
IFNULL(LOGICAL_AND(x), true)	EVERY(x)
Arrays
ARRAY_AGG(x)	NEST(x)
ANY_VALUE(x)	ANY(x)
arr[SAFE_ORDINAL(index)]	NTH(index, arr) WITHIN RECORD
ARRAY_LENGTH(arr)	COUNT(arr) WITHIN RECORD
Url / IP Address Functions
NET.HOST(url)	HOST(url)
NET.PUBLIC_SUFFIX(url)	TLD(url)
NET.REG_DOMAIN(url)	DOMAIN(url)
NET.IPV4_TO_INT64( NET.IP_FROM_STRING( addr_string))	PARSE_IP(addr_string)
NET.IP_TO_STRING( NET.IPV4_FROM_INT64( addr_int64 & 0xFFFFFFFF))	FORMAT_IP(addr_int64)
NET.IP_FROM_STRING(addr_string)	PARSE_PACKED_IP(addr_string)
NET.IP_TO_STRING(addr_bytes)	FORMAT_PACKED_IP(addr_bytes)