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04.21.2006 at 03:14AM PDT, ID: 21822023
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9.6

egrep YYYYMMDD

Asked by mj62mj62 in Unix Systems Programming

Tags: , ,

Hello,

Does anyone have an egrep regular expression (regex) for valid dates in the format YYYYMMDD?

It's fairly simple for basic checking, for example the DD bit could be:
[0-3][0-9] but that doesn't catch invalid days like 38.

if I write a full regex, starting with ^ and ending in $, I can then use the | (the OR option) along with a second full regex to capture the two cases of [0-2][0-9] and [3][0-1], however that is quite long. (ie. ^<full regex>$|^<second full regex>$)

Ideally I'd like to be able to do an embedded OR within a single regex to capture that 29 is a valid day by 39 is not.  But I can't figure out how to do that.

Of course, something that captured leap years and fancy stuff like that would be awesome, but I'm not holding my breath on it. :)

Thank You,
MJStart Free Trial
 
 
[+][-]04.21.2006 at 03:22AM PDT, ID: 16505936

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About this solution

Zone: Unix Systems Programming
Tags: yyyymmdd, regex, egrep
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Solution Provided By: ozo
Participating Experts: 1
Solution Grade: A
 
 
[+][-]04.21.2006 at 03:49AM PDT, ID: 16506070

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