Remove text from a text file without otherwise altering the file

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Morpheuskibbe
Morpheuskibbe 2018-6-11
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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Paolo
Paolo 2018-6-11
编辑：Paolo 2018-6-11
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
  6 个评论
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Guillaume
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
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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