Oracle regex match
To select a matched string with a prefix but not include the prefix
In the following example, it searches for number that follows an abc prefix, but return only the number
select regexp_substr('jdfal2sk12jdfabc123fadkljd1234fl','(abc)([0-9]+)',1,1,null,2) from dual
This will return 123
regexp_substr
The first parameter is the full text
the second parameter is the regex pattern
the third parameter is the starting position
the fourth is the occurrence
the fifth !!! specifiies which matched group of the regex pattern is returned.
In the example, the (abc) is the first group, enclosed by brackets, the second group ([0-9]+) is the number.
In python or .net or anywhere that supports full version of regex
(?<=abc)[0-9]+ will do the trick
but the lookbehind (?<=abc) is not supported by oracle