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How to correctly write regular expression to match ASCII control chars

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2

1

I would like to to create a regular expression in elisp (in the standard 'read' form) to match extended ASCII chars the same as PCRE does:

^[a-zA-Z_x7f-xff][a-zA-Z0-9_x7f-xff]*$

So, I'm currently сonfused about x7f-xff. Is there a way to set a range using something like xhh?

regular-expressions

share|improve this question

edited Apr 14 at 15:59

serghei

asked Apr 14 at 14:54

sergheiserghei

190111

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think the answer depends on whether you're matching against unibyte or multibyte strings. Do you think À (which is undefined in ASCII, 0xC0 in latin-1 and Unicode, but encoded as 0xC380 in UTF-8) falls into the range 0x7F-0xFF?
  
  – npostavs
  Apr 14 at 15:34
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think so. At least PCRE matched À as a char in 0x7F-0xFF range. I need the same behavior for standard Elisp regular expression.
  
  – serghei
  Apr 14 at 16:13
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  And as I can see À is defined in ASCII: ascii-code.com. 0xC0 is between 0x7F and 0xFF
  
  – serghei
  Apr 14 at 16:19
  

  
  
  
  

add a comment | 

2

1

I would like to to create a regular expression in elisp (in the standard 'read' form) to match extended ASCII chars the same as PCRE does:

^[a-zA-Z_x7f-xff][a-zA-Z0-9_x7f-xff]*$

So, I'm currently сonfused about x7f-xff. Is there a way to set a range using something like xhh?

regular-expressions

share|improve this question

edited Apr 14 at 15:59

serghei

asked Apr 14 at 14:54

sergheiserghei

190111

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think the answer depends on whether you're matching against unibyte or multibyte strings. Do you think À (which is undefined in ASCII, 0xC0 in latin-1 and Unicode, but encoded as 0xC380 in UTF-8) falls into the range 0x7F-0xFF?
  
  – npostavs
  Apr 14 at 15:34
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think so. At least PCRE matched À as a char in 0x7F-0xFF range. I need the same behavior for standard Elisp regular expression.
  
  – serghei
  Apr 14 at 16:13
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  And as I can see À is defined in ASCII: ascii-code.com. 0xC0 is between 0x7F and 0xFF
  
  – serghei
  Apr 14 at 16:19
  

  
  
  
  

add a comment | 

I would like to to create a regular expression in elisp (in the standard 'read' form) to match extended ASCII chars the same as PCRE does:

^[a-zA-Z_x7f-xff][a-zA-Z0-9_x7f-xff]*$

So, I'm currently сonfused about x7f-xff. Is there a way to set a range using something like xhh?

regular-expressions

share|improve this question

edited Apr 14 at 15:59

serghei

asked Apr 14 at 14:54

sergheiserghei

190111

^[a-zA-Z_x7f-xff][a-zA-Z0-9_x7f-xff]*$

share|improve this question

edited Apr 14 at 15:59

serghei

asked Apr 14 at 14:54

sergheiserghei

190111

share|improve this question

edited Apr 14 at 15:59

serghei

asked Apr 14 at 14:54

sergheiserghei

190111

asked Apr 14 at 14:54

sergheiserghei

190111

asked Apr 14 at 14:54

sergheiserghei

190111

1 Answer
1

active

oldest

votes

1

You can use -ÿ instead of x7f-xff. That first character, which StackExchange prints as a space, is DEL, which has codepoint 127 (decimal), #o177 (octal), and #x7f (hexadecimal).

That is, you can just insert the characters themselves in the regexp pattern.

One way to input such characters is to use C-x 8 RET. To search for any char in the range x7f through xff you would type this at the C-M-s prompt (without the spaces):

[ C-x 8 RET # x 7 f - C-x 8 RET # x f f ]

share|improve this answer

edited Apr 14 at 17:52

answered Apr 14 at 17:46

DrewDrew

49.3k464110

add a comment | 

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1

You can use -ÿ instead of x7f-xff. That first character, which StackExchange prints as a space, is DEL, which has codepoint 127 (decimal), #o177 (octal), and #x7f (hexadecimal).

That is, you can just insert the characters themselves in the regexp pattern.

One way to input such characters is to use C-x 8 RET. To search for any char in the range x7f through xff you would type this at the C-M-s prompt (without the spaces):

[ C-x 8 RET # x 7 f - C-x 8 RET # x f f ]

share|improve this answer

edited Apr 14 at 17:52

answered Apr 14 at 17:46

DrewDrew

49.3k464110

add a comment | 

1

You can use -ÿ instead of x7f-xff. That first character, which StackExchange prints as a space, is DEL, which has codepoint 127 (decimal), #o177 (octal), and #x7f (hexadecimal).

That is, you can just insert the characters themselves in the regexp pattern.

One way to input such characters is to use C-x 8 RET. To search for any char in the range x7f through xff you would type this at the C-M-s prompt (without the spaces):

[ C-x 8 RET # x 7 f - C-x 8 RET # x f f ]

share|improve this answer

edited Apr 14 at 17:52

answered Apr 14 at 17:46

DrewDrew

49.3k464110

add a comment | 

You can use -ÿ instead of x7f-xff. That first character, which StackExchange prints as a space, is DEL, which has codepoint 127 (decimal), #o177 (octal), and #x7f (hexadecimal).

That is, you can just insert the characters themselves in the regexp pattern.

One way to input such characters is to use C-x 8 RET. To search for any char in the range x7f through xff you would type this at the C-M-s prompt (without the spaces):

[ C-x 8 RET # x 7 f - C-x 8 RET # x f f ]

share|improve this answer

edited Apr 14 at 17:52

answered Apr 14 at 17:46

DrewDrew

49.3k464110

share|improve this answer

edited Apr 14 at 17:52

answered Apr 14 at 17:46

DrewDrew

49.3k464110

answered Apr 14 at 17:46

DrewDrew

49.3k464110

answered Apr 14 at 17:46

DrewDrew

49.3k464110