Replacing certain text from a .txt file.
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How can the following expressions be replaced? For example expressions of the form:
FirstText [Text1@/ Text2@/ Text3] LastText
is to be preplaced by
FirstText Text1 LastText; FirstText Text2 LastText; FirstText Text3 LastText
采纳的回答
If it is all you have to do, here is an example:
str = 'FirstText [Text1@/ Text2@/ Text3] LastText' ;
tokens = regexp( str, '(.*)[([^@]+)@/ ([^@]+)@/ ([^\]]+)\] (.*)', 'tokens', 'once' ) ;
outStr = sprintf( '%s %s %s; %s %s %s; %s %s %s', tokens{[1,2,5,1,3,5,1,4,5]} ) ;
which outputs
outStr = FirstText Text1 LastText; FirstText Text2 LastText; FirstText Text3 LastText
Note that you don't need regular expressions for this:
tokens = strsplit( str, {' [', '@/ ', '] '} )
tokens =
1×5 cell array
'FirstText' 'Text1' 'Text2' 'Text3' 'LastText'
But what is the context? I suspect that you have to apply this to a more complex case. Could you give a real slice of what you have to process?
9 个评论
per isakson
2017-9-13
and me too
>> cac = regexp( str, '[^\w]+', 'split' );
>> cac
cac =
'FirstText' 'Text1' 'Text2' 'Text3' 'LastText'
>>
am
2017-9-13
No you likely won't have to loop, but you have to clarify the situation, or even better attach a sample file. Can FirstText and LastText contain delimiters like \@, [, or ] ? Are there multiple [...] blocks?
If not, then both REGEXP and STRSPLIT (better in this simple case) approaches should work on your file content. Give it a try:
str = fileread( 'YourTextFile.txt' ) ;
and then apply either approach and see what you get. If it doesn't work, please attach some more realistic slice of your file, or even better the whole file.
Are there multiple entries like this in the file? Is it one entry per line? E.g.
Data.txt:
A [B@/ C] D
E [F@/ G@/ H@/ I] J
[K@/ L] M
N [O@/ P]
If not, what is the separator?
I think that your second example could be better understood if you were using unique text IDs, i.e. text1 to text4, as I suppose that all entries in each bracket are not equivalent.
Finally, what is the purpose? The general case with an arbitrary number of brackets and an arbitrary number of items in each bracket will require quite a bit of coding..
am
2017-9-19
Cedric
2017-9-19
What is the separator between these entries? Is it the period? If there is no separator, does that mean that you need to extract all elements of all [..] blocks in a file and use all possible combinations?
And again, we is the purpose? If you gave a little more information, you may have more answers. Solving the general case with a lot of blocks and a lot of elements per block may be quite a bit of work, so the better you define the context, the more likely you are to get help.
Jan
2017-9-27
'(.*)[([^@]+)@/ ([^@]+)@/ ([^\]]+)\] (.*)'
Be careful. Obviously the angry armadillo has entered your keyboard. [I've grown up in a time, when humor was not marked by smileys, but recognized by mind reading] Nevertheless, +1.
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