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replace only the first match

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Andrew
Andrew 2013-1-21
评论： Jan 2021-4-20
I have a txt with 2000 lines. i want to open the txt,scan,find EE1 and replace it(only the first EE1,not the second) then create a new txt and close...
this is something a found but it replace all the EE1 it found.I want to replace only the first match..
close all; clear; clc
% Set user specific paths and values
% ======================================================================
HFSS_EXE_PATH='C:\Program Files (x86)\Ansoft\HFSS12';
SCRIPT_PATH='c:\HFSS\scriptttt.vbs';
NEW_VBS_FILE='c:\HFSS\scrip.vbs';
% ======================================================================
cc=0;
for wg_y=6:1:8
cc=cc+1;
% Replace first occurrence of waveguide Y dimension
%vbs_str=file2str(SCRIPT_PATH);
fid1=fopen(SCRIPT_PATH,'r+');
vbs_str=fscanf(fid1,'%c');
old_str=('Array("NAME:XSize", "Value:=", "EE1"');
new_str=sprintf('Array("NAME:XSize", "Value:=", "%1.0fmm")',wg_y);
new_vbs_str=strrep(vbs_str,old_str,new_str);
% Create updated VB script file
fid=fopen(NEW_VBS_FILE,'w');
fprintf(fid,'%s',new_vbs_str);
fclose(fid);
end
Thank you...

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采纳的回答

Jan
Jan 2013-1-21
编辑：Jan 2013-1-21
index = strfind(vbs_str, old_str);
first = index(1);
vbs_str = [vbs_str(1:first - 1), new_str, vbs_str(first + length(old_str):end)];
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prashanth u
prashanth u 2021-4-19
What is new_str at 3rd line@Jan?
Jan
Jan 2021-4-20
new_str is the variable from the code in the question.

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