* [9fans] Sam: Is This a Bug?
@ 2024-10-03 21:37 kalterdev
2024-10-03 21:55 ` umbraticus
0 siblings, 1 reply; 3+ messages in thread
From: kalterdev @ 2024-10-03 21:37 UTC (permalink / raw)
To: 9fans
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Consider the following sample text:
foo
bar
baz
qux
quux
The purpose is to merge each pair of words, so that the text becomes:
foobar
bazqux
quux
The following command works fine:
x/.+\n.+/ x/\n/ d
But the following one does not:
x/.*\n.*/ x/\n/ d
It results in all \n being deleted.
I suppose it's because .* matches an empty string in this case. But
it really shouldn't. Sam's regular expressions are leftmost-longest.
And there's seemingly nothing that must stop both .* from extending.
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* Re: [9fans] Sam: Is This a Bug?
2024-10-03 21:37 [9fans] Sam: Is This a Bug? kalterdev
@ 2024-10-03 21:55 ` umbraticus
2024-10-03 22:01 ` kalterdev
0 siblings, 1 reply; 3+ messages in thread
From: umbraticus @ 2024-10-03 21:55 UTC (permalink / raw)
To: 9fans
try this and it should make sense:
x/.+\n.*/ x/\n/ d
with .* to the left of the \n you get the following:
match foo\nbar and delete the \n
match \nbaz and delete the \n
match \nqux and delete the \n
match \nquux and delete the \n
match \n and delete it
umbraticus
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* Re: [9fans] Sam: Is This a Bug?
2024-10-03 21:55 ` umbraticus
@ 2024-10-03 22:01 ` kalterdev
0 siblings, 0 replies; 3+ messages in thread
From: kalterdev @ 2024-10-03 22:01 UTC (permalink / raw)
To: 9fans
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Now I see. Thank you.
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2024-10-03 22:01 ` kalterdev
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