Remove text from a text file without otherwise altering the file

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Morpheuskibbe 2018-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/405094-remove-text-from-a-text-file-without-otherwise-altering-the-file

编辑： Paolo 2018-6-11

I need to remove text from a text file without otherwise altering the file INCLUDING other text in the same line. specifically I need the text of the form 'E\S+' (ie "E3453.464") to go away without otherwise altering the line.

so this: G1 X104.650 Y95.350 E4.58979 should become this G1 X104.650 Y95.350

and this G1 E-2.00000 F2400.00000 should become this G1 F2400.00000

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采纳的回答

Paolo 2018-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/405094-remove-text-from-a-text-file-without-otherwise-altering-the-file#answer_324160

编辑：Paolo 2018-6-11

在 MATLAB Online 中打开

You can use regexprep for this purpose.

 x1 = 'G1 X104.650 Y95.350 E4.58979';
 x2 = 'G1 E-2.00000 F2400.00000';
 x1 = regexprep(x1,'(E-?)([0-9]){0,}\.?(\d+)\s?','');
 x2 = regexprep(x2,'(E-?)([0-9]){0,}\.?(\d+)\s?','');
 x1 = 'G1 X104.650 Y95.350 '
 x2 = 'G1 F2400.00000'

The expression:

Match E
Match '-' optionally
Match numbers 0-9 at least one time
Match '.' optionally
Match as many digits as possible
Match whitespace optionally

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Guillaume 2018-6-11

Note that {0,} is the same as * and {1,} is the same as + in regular expressions. In my opinion, E-{0,} should be E-? (aka E-{0,1})

Paolo 2018-6-11

编辑：Paolo 2018-6-11

Totally, the first E-{0,} is actually meant to be E-?, as from the examples OP gave there is only one '-' character. While editing I changed both of them rather than just the second one...

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