Your original question said
Search first four comma or tab separated alpha numeric values
implying that your input might have mixed delimiters. If so, and if a given line is either comma-delimited or tab-delimited, then you need an alternation of the ikegami and Cristoforo regexes from above, like so: 
print grep /
               ^
               (?:
                   (?:[^,]*,){4},{3}\d,0,\d
               |
                   (?:[^\t]*\t){4}\t{3}\d\t0\t\d
               )
           /x, <DATA>;

[download]
If the two delimiters can be mixed on the same line, then: 
print grep /^(?:[^,\t]*[,\t]){4}[,\t]{3}\d[,\t]0[,\t]\d/, <DATA>;

[download]

Updated:No need for capturing in the alternation.

In reply to Re: regular expression help by broomduster
in thread regular expression help by bobafett

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