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sed's greediness seemingly violated

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

0

I would have thought these two invocations of sed would return the same output given that it looks for patterns in a greedy fashion by default. Why not?

$ echo '<a href="/topic/null-hypothesis/" data-sc="text link:topic link">Null hypothesis</a>' | grep -E '<a href="/topic.*</a>' | sed 's/<a href=.*">//'

Null hypothesis</a>



$ echo '<a href="/topic/null-hypothesis/" data-sc="text link:topic link">Null hypothesis</a>' | grep -E '<a href="/topic.*</a>' | sed 's/<a href=.*>//'

PS:

$ bash --version

bash --version

GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)

PS2: I corrected from sed to grep.

PS3: Corrected back from grep to sed.

sed

share|improve this question

edited 25 secs ago

Erwann

asked 37 mins ago

ErwannErwann

3911 silver badge88 bronze badges

add a comment | 

0

I would have thought these two invocations of sed would return the same output given that it looks for patterns in a greedy fashion by default. Why not?

$ echo '<a href="/topic/null-hypothesis/" data-sc="text link:topic link">Null hypothesis</a>' | grep -E '<a href="/topic.*</a>' | sed 's/<a href=.*">//'

Null hypothesis</a>



$ echo '<a href="/topic/null-hypothesis/" data-sc="text link:topic link">Null hypothesis</a>' | grep -E '<a href="/topic.*</a>' | sed 's/<a href=.*>//'

PS:

$ bash --version

bash --version

GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)

PS2: I corrected from sed to grep.

PS3: Corrected back from grep to sed.

sed

share|improve this question

edited 25 secs ago

Erwann

asked 37 mins ago

ErwannErwann

3911 silver badge88 bronze badges

add a comment | 

I would have thought these two invocations of sed would return the same output given that it looks for patterns in a greedy fashion by default. Why not?

$ echo '<a href="/topic/null-hypothesis/" data-sc="text link:topic link">Null hypothesis</a>' | grep -E '<a href="/topic.*</a>' | sed 's/<a href=.*">//'

Null hypothesis</a>



$ echo '<a href="/topic/null-hypothesis/" data-sc="text link:topic link">Null hypothesis</a>' | grep -E '<a href="/topic.*</a>' | sed 's/<a href=.*>//'

PS:

$ bash --version

bash --version

GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)

PS2: I corrected from sed to grep.

PS3: Corrected back from grep to sed.

sed

share|improve this question

edited 25 secs ago

Erwann

asked 37 mins ago

ErwannErwann

3911 silver badge88 bronze badges

$ echo '<a href="/topic/null-hypothesis/" data-sc="text link:topic link">Null hypothesis</a>' | grep -E '<a href="/topic.*</a>' | sed 's/<a href=.*">//'

Null hypothesis</a>



$ echo '<a href="/topic/null-hypothesis/" data-sc="text link:topic link">Null hypothesis</a>' | grep -E '<a href="/topic.*</a>' | sed 's/<a href=.*>//'

$ bash --version

bash --version

GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)

share|improve this question

edited 25 secs ago

Erwann

asked 37 mins ago

ErwannErwann

3911 silver badge88 bronze badges

share|improve this question

edited 25 secs ago

Erwann

asked 37 mins ago

ErwannErwann

3911 silver badge88 bronze badges

asked 37 mins ago

ErwannErwann

3911 silver badge88 bronze badges

asked 37 mins ago

ErwannErwann

3911 silver badge88 bronze badges

1 Answer
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0

I don't see any violation here. "> is matched by the end of link">, but not by the end of </a>, which is matched by just >.

share|improve this answer

answered 30 mins ago

murumuru

40.2k55 gold badges9898 silver badges172172 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I didn't say there was a violation, but a seeming one. The interrogation pertains not to the first invocation, but the second: I would like to match the first >.
  
  – Erwann
  27 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, no violation, seemingly or otherwise. If you would like to match the first >, then you will need to exclude > from the characters matched in between. [^>]*>
  
  – muru
  23 mins ago
  

  
  
  
  

add a comment | 

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0

I don't see any violation here. "> is matched by the end of link">, but not by the end of </a>, which is matched by just >.

share|improve this answer

answered 30 mins ago

murumuru

40.2k55 gold badges9898 silver badges172172 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I didn't say there was a violation, but a seeming one. The interrogation pertains not to the first invocation, but the second: I would like to match the first >.
  
  – Erwann
  27 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, no violation, seemingly or otherwise. If you would like to match the first >, then you will need to exclude > from the characters matched in between. [^>]*>
  
  – muru
  23 mins ago
  

  
  
  
  

add a comment | 

0

I don't see any violation here. "> is matched by the end of link">, but not by the end of </a>, which is matched by just >.

share|improve this answer

answered 30 mins ago

murumuru

40.2k55 gold badges9898 silver badges172172 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I didn't say there was a violation, but a seeming one. The interrogation pertains not to the first invocation, but the second: I would like to match the first >.
  
  – Erwann
  27 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, no violation, seemingly or otherwise. If you would like to match the first >, then you will need to exclude > from the characters matched in between. [^>]*>
  
  – muru
  23 mins ago
  

  
  
  
  

add a comment | 

I don't see any violation here. "> is matched by the end of link">, but not by the end of </a>, which is matched by just >.

share|improve this answer

answered 30 mins ago

murumuru

40.2k55 gold badges9898 silver badges172172 bronze badges

share|improve this answer

answered 30 mins ago

murumuru

40.2k55 gold badges9898 silver badges172172 bronze badges

answered 30 mins ago

murumuru

40.2k55 gold badges9898 silver badges172172 bronze badges

answered 30 mins ago

murumuru

40.2k55 gold badges9898 silver badges172172 bronze badges