Remove first selected character

Hi all,
I have one requirement , in my one table A _POSTN there is Column NAME I this column values like
DEFAULT_NZ_FUELS_WHOLESALE_1,
Z_FALAGUB,
DEFAULT_UK_ILS_LUBES_1
etc
I want output for only those record Z_FALAGUB, Z_REHMEN, output should remove “Z_” and FALAGUB, REHMEN like that
I am trying “SUBSTR(E.NAME,INSTR(E.NAME,'Z_')+2) from dual “ this statements
But it is removing “DEFAULT_NZ_FUELS_WHOLESALE” Z_ also . can anyone help me for that

You want to test if the first two characters contain 'Z_', while INSTR will check the whole string.
If found at the start, it will return 1 and you will want to to start the first SUBSTR from position 3 and otherwise start from 0 (that's what the DECODE is for).
I did this without really testing, but give it a try.
SUBSTR(E.NAME, DECODE(INSTR(E.NAME, 'Z_'), 1, 3, 0)) from dual

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