Replace string with another value

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klb
klb 2020-7-4
编辑： klb 2020-7-4
What would be a good way replace a full string with first 3 letters of last word. For example '13 Jon Walker' with 'WAL' .
I have about 25 such replacements an this is indeed doable line-by-line "by-hand" using replace function, but that beats the purpose of MATLAB. Plus i might have more in future. I looked up regexprep too but it doesnt quite do that. OR have I missed it ? Is there a way I could apply a 'replace full string with first 3 letters of last word ' rule?
Thank you for your time in advance.

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Walter Roberson
Walter Roberson 2020-7-4
S = {'13 Jon Walker', '23 skidoo', '0 infinite way blvd'};
upper(regexprep(S, '^.*\s+(...).*', '$1'))
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klb
klb 2020-7-4
编辑：klb 2020-7-4
Thank you this works! Could you please explain the meaning of qualifiers though.
Could you also clarify this if possible:
replace(13 Jon Walker,'WAL') returns '13 Jon Walker' not 'WAL' But
replace(13 Jon Walker,'WAL') returns 'WAL' .
Why would that be?

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