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Hashmat  
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 More options Nov 7, 12:55 pm
From: Hashmat <hashmat.em...@gmail.com>
Date: Sat, 7 Nov 2009 09:55:09 -0800 (PST)
Local: Sat, Nov 7 2009 12:55 pm
Subject: Find Hex number
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Hello,

Suppose I have this hex input: "78FE8909CD" etc

Can somebody please let me know what should be the RE to find a
particular byte ?

Say I want to find 8F from the above input ?
RE should return false, because 8F is not found as a byte because the
bytes would be:7F, FE, 89, etc

Is is possible to find this using RE ?

thanks
Hashmat


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inhahe  
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 More options Nov 8, 2:40 am
From: inhahe <inh...@gmail.com>
Date: Sun, 8 Nov 2009 02:40:53 -0500
Local: Sun, Nov 8 2009 2:40 am
Subject: Re: Find Hex number
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hmm, maybe this

.{2]*?8F.*


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Ashmath Khan  
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 More options Nov 8, 5:59 am
From: Ashmath Khan <hashmat.em...@gmail.com>
Date: Sun, 8 Nov 2009 16:29:41 +0530
Local: Sun, Nov 8 2009 5:59 am
Subject: Re: Find Hex number
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Thanks.
How do I find if a particular character is not present in a string ?
If I use [^0x1f] it would mean any character other than 1f. How do write a
RE which would mean if 1f is not present ? In other words if the patter 1f
is not matched.

thanks
Ashmath


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Затлер Евгений Викторович  
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 More options Nov 10, 5:07 am
From: Затлер Евгений Викторович <eugenysatt...@gmail.com>
Date: Tue, 10 Nov 2009 14:07:30 +0400
Local: Tues, Nov 10 2009 5:07 am
Subject: Re: Find Hex number
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On Sun, Nov 8, 2009 at 11:40 AM, inhahe <inh...@gmail.com> wrote:
> hmm, maybe this
> .{2]*?8F.*

1) closing bracket incorrect. should be }

2) .{2,} construct allows any symbol to be repeated 3 times or 5
times, i.e. uneven number of times. This should be forbidden in this
case.

So, I suggest

^([0-9a-z][0-9a-z])*8F([0-9a-z][0-9a-z])*$

--
regards,     Eugeny


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Eugeny Sattler  
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 More options Nov 10, 5:31 am
From: Eugeny Sattler <eugeny.satt...@gmail.com>
Date: Tue, 10 Nov 2009 14:31:02 +0400
Local: Tues, Nov 10 2009 5:31 am
Subject: Re: Find Hex number
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> How do I find if a particular character is not present in a string ?
> If I use [^0x1f] it would mean any character other than 1f.

Nope. [^0x1f] will be treated as any symbol which is not a zero, not a
literal "x", not 1 and not "f"

[^\x1F] is the right syntax for what you meant.

> How do write a RE which would mean if 1f is not present ? In other words if the patter 1f
> is not matched.

1st approach
Check if 1F is present. And if it is present do nothing. Else do what you need.

2nd approach:
^[^\x1F]*$
will match a set of symbols each and every of them is not 1F

--
best regards,          Eugeny


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