Using substr/instr on a tab delimited txt file

Hi I am trying to figure out how to load data into variables using PLSQL.  I have been using substr to load the data into each variable.  For example,

vStockNum                 := substr(vBuffer,1,instr(vBuffer,vTab,1,1));

vBuffer is a line from what the UTL_FILE variable is reading in.  The problem I am having is the part named vTab.  How do you search for a tab.  If it was a comma, it would be ',' but since we are dealing with a tab rather than a punctuation mark its more challenging.  I've tried doing the manual way of '     ', but that doesn't work either.  Any ideas on what I could try?
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   Yes, use the chr function.  A tab is a chr(1).  But don't you want to strip off the tab?  That would be:

vStockNum                := substr(vBuffer,1,instr(vBuffer,chr(10),1,1) - 1);

Good luck!

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