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How to correctly write regular expression to match ASCII control chars
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
Announcing the arrival of Valued Associate #679: Cesar Manara
Unicorn Meta Zoo #1: Why another podcast?How can I test and use a Perl regular expression interactively?How do I create a dynamic regexp with rx?How to save part of a regular expression during search and replace?Custom Major Mode - Regex to find word before equal sign and set font-lock-variable-name-faceHow to escape regexp special characters in a string?How to match more than one instance of a single subexpression?why is this trim-space function so complicated/ugly in emacs lisp?How to match symbol in regexp?JavaScript regular expressions in re-builderChange regex-builder-mode hook to use <C-s>
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
asked 5 hours ago
sergheiserghei
187110
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
asked 5 hours ago
sergheiserghei
187110
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
5 hours ago
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
4 hours ago
And as I can seeÀis defined in ASCII: ascii-code.com. 0xC0 is between 0x7F and 0xFF
– serghei
4 hours ago
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
asked 5 hours ago
sergheiserghei
187110
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
regular-expressions
asked 5 hours ago
sergheiserghei
187110
asked 5 hours ago
sergheiserghei
187110
edited 4 hours ago
serghei
asked 5 hours ago
sergheiserghei
187110
asked 5 hours ago
sergheiserghei
187110
asked 5 hours ago
sergheiserghei
187110
187110
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
5 hours ago
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
4 hours ago
And as I can seeÀis defined in ASCII: ascii-code.com. 0xC0 is between 0x7F and 0xFF
– serghei
4 hours ago
add a comment |
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
5 hours ago
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
4 hours ago
And as I can seeÀis defined in ASCII: ascii-code.com. 0xC0 is between 0x7F and 0xFF
– serghei
4 hours ago
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
5 hours ago
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
5 hours ago
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
4 hours ago
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
4 hours ago
And as I can see
À is defined in ASCII: ascii-code.com. 0xC0 is between 0x7F and 0xFF– serghei
4 hours ago
And as I can see
À is defined in ASCII: ascii-code.com. 0xC0 is between 0x7F and 0xFF– serghei
4 hours ago
add a comment |
1 Answer
1
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oldest
votes
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 ]
answered 2 hours ago
DrewDrew
49.1k463108
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
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active
oldest
votes
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 ]
answered 2 hours ago
DrewDrew
49.1k463108
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 ]
answered 2 hours ago
DrewDrew
49.1k463108
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 ]
answered 2 hours ago
DrewDrew
49.1k463108
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 ]
answered 2 hours ago
DrewDrew
49.1k463108
edited 2 hours ago
answered 2 hours ago
DrewDrew
49.1k463108
answered 2 hours ago
DrewDrew
49.1k463108
answered 2 hours ago
DrewDrew
49.1k463108
49.1k463108
add a comment |
add a comment |
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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
5 hours ago
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
4 hours ago
And as I can see
Àis defined in ASCII: ascii-code.com. 0xC0 is between 0x7F and 0xFF– serghei
4 hours ago