regex replace whole word
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Hi,
How to change
'v1 = v1a;'
to
'v(1) = v1a;'
using regex or regexrep?
regexprep('v1 = v1a','\bv1\b','v(1)')
apparently does not work.
采纳的回答
>> regexprep('v1 = v1a','^([a-z]+)(\d+)','$1($2)')
ans = v(1) = v1a
Hopefully you are not constructing arbitrary strings of code for evaluating!
8 个评论
Bardo
2018-6-1
"The "whole word" will be a valid variable name (can contain underscore)."
Valid variable names can also contain numbers: what happens to them? If you only want to match letters and underscore, then try this:
'^([A-Za-z_]+)(\d+)'
"I a second place I need a string equivalent for the symbolic subs(s, old, new). Have an idea?"
What are you actually trying to achieve with all of this? My idea would be to not write code that relies on creating strings and evaluating them.
Bardo
2018-6-1
What you have shown does not require regular expressions: you could just as easily use strrep for what you are doing, or even basic indexing and concatenation:
>> str = 'v1 = v1a';
>> str = ['v(1)',str(3:end)]
str = v(1) = v1a
What you wrote is not much different from that really, and does not use any of the benefits of regular expressions, so it is unclear why you want to use regexprep.
In contrast this will work for any variable name (not just v1), including underscores, and relies on the regular expression to match location in the string and different kinds of characters:
>> regexprep('v1 = v1a','^([A-Za-z_]+)(\d+)','$1($2)')
ans = v(1) = v1a
But it all depends on what you are trying to do, so without a clear specification, this is all just observations on what can be seen on this thread.
Bardo
2018-6-1
Bardo
2018-6-1
Stephen23
2018-6-1
@Bardo: you should accept your answer, if it resolves your original question.
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