grep - Regex for Negative Lookahead -


i need regex match using egrep checks pattern following 1_0_5 in long request string. if consider pattern a_b_c. want b apart 2, 3, 4 , 13.

this should it:

grep -p '\b[^_]+_(?!(2|3|4|13)_)[^_]+_[^_]+\b' myfile

if terms digits, refine this:

grep -p '\b\d+_(?!(2|3|4|13)_)\d+_\d+\b' myfile

note -p flag turn on perl comparability, allows aheads


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