replacing text in a string using indexing

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Lin
Lin 2022-9-21
编辑： Stephen23 2022-9-21
how could replace text by just using one line of code
e.g. a = 'qqqqqq' and I want to make q = 'qweqwe'

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回答（2 个）

Mathieu NOE
Mathieu NOE 2022-9-21
I win the prize !
out = strrep('qqqqqq','qqqqq','qwe')
out =
'qweqwe'
  2 个评论
Lin
Lin 2022-9-21
thanks !
but what if i want to make 'qqqqqqqqqq' to 'qweqweqweq'
sorry for the dumb question, still a rookie and have a hard beginning using matlab
Mathieu NOE
Mathieu NOE 2022-9-21
look at the doc for function strrep
strrep Find and replace substring.
MODIFIEDTEXT = strrep(ORIGTEXT,OLDSUBTEXT,NEWSUBTEXT) replaces all
occurrences of the text OLDSUBTEXT within text ORIGTEXT with the
text NEWSUBTEXT.
the trick here is to count how many times you want the pattern 'qwe' repeated in the output (modified) text
you last query request 3 time 'qwe' to make 'qweqweqweq' so we will take the input text ('qqqqqqqqqq') and remove 3 - 1 = 2 'q' from this character to create the subtext
here a liitle demo where I remove 0,1,2 times the q
out1 = strrep('qqqqqqqqqq' ,'qqqqqqqqqq' ,'qwe') % zero 'q' removed in subtext (compared to input text)
out2 = strrep('qqqqqqqqqq' ,'qqqqqqqqq' ,'qwe') % one 'q' removed in subtext
out3 = strrep('qqqqqqqqqq' ,'qqqqqqqq' ,'qwe') % two 'q' removed in subtext
out1 = 'qwe'
out2 = 'qweqwe'
out3 = 'qweqweqwe'

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Stephen23
Stephen23 2022-9-21
编辑：Stephen23 2022-9-21
Ran in:
For overlapping matches use STRREP.
For non-overlapping matches use REGEXPREP:
regexprep('qqqqqq','qqq','qwe')
ans = 'qweqwe'
regexprep('qqqqqqqqq','qqq','qwe')
ans = 'qweqweqwe'

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