replacing a number in a string

2018 1 26

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Hi i have a string s='21-x1 4000. 4000. 0.'and i would like to replace the first 4000 without replacing the second 4000, i did use

strrep(s,'4000','1512.45')

but the outcome was ns = '21-x1 1512.45 1512.45 0.'

thanks,

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Walter Roberson 2018-1-26

1 个投票

s='21-x1 4000. 4000. 0.';
regexprep(s, '4000', '1512.45', 'once')

many thanks

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