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07.05.2007 at 04:05AM PDT, ID: 22676488
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7.6

Regular expression riddles

Asked by danielwatts in Bourne-Again Shell (bash), Shell Scripting, Regular Expressions

Tags: , ,

Question about use of regular expressions on the linux command line (bash):

Could someone explain why each of the following behave as they do?
I am quite stumped:

[Ignores the escaped dollar]
tg4 register # echo "$" | sed -r "s/\$/new/"                          
$new

[only works if you double escape the dollar]
tg4 register # echo "$" | sed -r "s/\\$/new/"
new

[works fine with a single escape on * - why is $ above special?]
tg4 register # echo "*" | sed -r "s/\*/new/"  
new

[double escape does same thing - why?]
tg4 register # echo "*" | sed -r "s/\\*/new/"
new

[..wh..what??! it's stuck it on the FRONT!]
tg4 register # echo "*" | sed -r "s/\\\*/new/"
new*

[so does    \\\* == ^   ???]
tg4 register # echo "*" | sed -r "s/^/new/"    
new*

Imagine it is some strange interplay with shell escaping vs perl escaping but can't figure it out. Start Free Trial
[+][-]07.05.2007 at 05:02AM PDT, ID: 19423276

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[+][-]07.05.2007 at 05:14AM PDT, ID: 19423321

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[+][-]07.05.2007 at 05:31AM PDT, ID: 19423424

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About this solution

Zones: Bourne-Again Shell (bash), Shell Scripting, Regular Expressions
Tags: bash, regular, expression
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Solution Provided By: Zvonko
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07.05.2007 at 05:37AM PDT, ID: 19423458

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[+][-]07.05.2007 at 05:52AM PDT, ID: 19423540

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[+][-]07.05.2007 at 06:17AM PDT, ID: 19423701

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[+][-]07.05.2007 at 06:50AM PDT, ID: 19423981

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[+][-]07.05.2007 at 08:12AM PDT, ID: 19424700

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