Dependent Origination

grep example

Posted on: August 3, 2011

i have always felt grep’s regular expression pattern a bit different than expectation.

here is an example:

the line format i am looking for is “number/number\tstuff\tstuff\etc”

I used ‘[0-9]+/[0-9]+’ to search through all the lines for the above format, to no avail. It found nothing.

Out of desperation, I tried ‘[0-9]/[0-9]’ as the pattern on command line and grep is returning all the lines — it is not returning all the lines with a single digit number as i was thinking at all.

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