I am a novice in regex and trying to understand it by solving small problems. So here I am with a problem which I couldn't solve (warning: it may be extremely silly). Your inputs will help me understand the concept.
I want to write a regex which will match all items in list1
but none of those from list2
list1
pit
spot
spate
slap two
respite
list2
pt
Pot
peat
part
I was thinking like "give me all the items that starts with 开发者_如何学编程p|s|r
and endswith it|ot|e|o
So i wrote ^[p|s|r].*[it|ot|e|o]$
which eventually resulted in undesired result.
Thanks in advance for your inputs.
In notepad you can't do or
operations (taken from Notepad++: A guide to using regular expressions and extended search mode and tested on my Notepad++ 5.9.3)
This would work in other "standard" regexes :-)
^[psr].*(it|ot|e|o)$
Try here. http://gskinner.com/RegExr/?2uudn
What were you doing was using the []
instead of the grouping ()
. It was equivalent to: [itoe|]
(were the |
was a "standard" character instead of or
) and in general everything in an []
is in or :-) [ab]
means a
or b
.
/(pit|spot|spate|slap two|respite)/.test('Pot')
This matches the words from list one, and none from list two
I feel like I must be missing something.
^(pit|spot|spate|slap two|respite)$
It depends entirely on how you categorise the differences between the lists:
/p[ioa\s]t/
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