Leaving out the parentheses changes the meaning because they group as
well as capture. #"a(b|c)d" matches either "abd" or "acd". #"ab|cd"
matches either "ab" or "cd".
On Tuesday, March 30, 2010, Glen Rubin wrote:
> thx that works great! i guess I can also just leave out the
> parenthesis all t
thx that works great! i guess I can also just leave out the
parenthesis all together.
but, what if i wanted just the portion inside?? the duplicate I
wanted to get rid of?
also any way to return the sequence without all those bars or do i
have to use a seperate regex and or filter?
On Mar 30,
Addendum: I highly recommend Jeffrey Friedl's book
_Mastering_Regular_Expressions_ if you want to learn how to use
regexes well. There are also a number of introductions/tutorials
online, but I'm not familiar enough with them to recommend any.
On Tue, Mar 30, 2010 at 12:50 PM, Mark J. Reed wrote
Parentheses capture - anything that matches a parenthesized portion of
a regular expression is returned as part of the result of the match:
user=> (re-seq #"a(.)c" "abc")
(["abc" "b"])
If you don't want that behavior, you can use the special non-capturing
syntax, (?:...):
user=> (re-seq #"a(?:.)
The result is a little bit strange still, since I am getting
dupliates. First, it returns the string I want
49|00|12 12|a9|a4|ff
but then it also returns the same string without the first and last 4
characters, e.g.
12|12|a9|
Also, how come I don't need to escape the | inside the pare
Hi,
you have to escape the |.
user=> (re-seq #"49\|00\|([0-9a-f|]+)\|a4\|ff" "a5|a5|49|23|49|00|12|
fc|5e|a4|ff|a7|49|00|ee|d3|a4|ff|ae")
(["49|00|12|fc|5e|a4|ff|a7|49|00|ee|d3|a4|ff" "12|fc|5e|a4|ff|a7|49|00|
ee|d3"])
However this will be greedy...
Sincerely
Meikel
--
You received this messa
I am having trouble with the re-seq regular expression form. I am not
an expert on regex, so this is probably part of my problem. I have a
k12 text file, basically it is hex broken up by '|' . I would like to
grab all the hex between two hex numbers (sample text below). For
example, I might wa
