Ah, I think I see now. Thanks for the explanation. Looks like I usually
want \h instead of \s (so as to exclude \n \r and a few other more
esoteric vertical whitespace).
-sam
On 12 Jan 2017, at 2:42 PM EST, Fletcher Sandbeck wrote:
I think it does what you're expecting if you change the pattern so the
whitespace match isn't greedy: ^\s*?$
\s matches returns and newlines so your pattern ^\s*$ should match any
block of lines which contain only whitespace. With the non-greedy
modifier it instead stops at the first end-of-line it finds so cycles
through each line which contains only whitespace in turns.
I am seeing some strange behavior, which you mention, where if the
cursor is at the start of the file it only matches lines 2 through 3,
but upon wrapping around it matches lines 2 through 4 as I'd expect.
[fletcher]
On Jan 12, 2017, at 11:22 AM, Sam Hathaway <[email protected]>
wrote:
Patrick,
Say I have this file:
----8<-cut-here----
one
two
----8<-cut-here----
(Line 2 and 4 are empty, line 3 consists of four spaces.)
And this pattern: ^\s*$
Shouldn’t it match these three ranges?
- zero chars on line 2
- four spaces on line three
- zero chars on line 3
Instead, it seems to match only one range:
- 6 chars: the linefeed at the end of line 2, the four spaces on line
three, and the linefeed at the end of line 3.
I’m still not seeing why ^\s*$ would match chars 5 through 10 (the
first empty line AND the line with 4 spaces) in one fell swoop, but
would not match char 11 (the 2nd empty line).
Shouldn’t it match these three ranges?
- zero chars after char 4
- four chars (“ ”) starting with char 6 and ending with char 9
- zero chars after char 10
Confused!
-sam
On 12 Jan 2017, at 10:46 AM EST, Patrick Woolsey wrote:
On 1/11/17 at 8:59 PM, [email protected] (Mike Pullen) wrote:
^\s*$ does not work for me in BBEdit. BBEdit does not find the
empty lines that proceeds the line containing "four" or the line
containing "six" in my test file.
It isn't expected to, since $ explicitly matches the position
_preceding_ the nearest line end:
[Chapter 8: Searching with Grep / page 166]
It is important to note that ^ and $ do not actually match return
characters. They match zero-width positions after and before
returns,
respectively. So, if you are looking for “foo” at the end of
a line,
the pattern "foo$" will match the three characters "f", "o", and
"o".
If you search for "foo\r", you will match the same text, but the
match will contain four characters: "f", "o", "o", and [the
linebreak which follows].
Regards,
Patrick Woolsey
==
Bare Bones Software, Inc. <http://www.barebones.com/>
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