Hi,
just wondering about the regular expression find/replace in DOORS:
I'm not sure about the regex flavor of DOORS. But for me it seems that regex backreferences (as \1 ... \9) are not possible. Maybe someone knows more??
Thanks a lot!
phil
SystemAdmin - Thu Nov 12 13:32:06 EST 2009 |
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Re: DOORS regex - backreferences not possible?
SystemAdmin - Thu Nov 12 13:33:24 EST 2009
Of course a version always helps ... We're using DOORS 8.2.0.2
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Re: DOORS regex - backreferences not possible?
SystemAdmin - Fri Nov 13 07:05:03 EST 2009
Look up Regular expressions in the DXL Help. Has a list of supported expressions and info regarding the use of Regexp in DXL coding.
/Kristian
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Re: DOORS regex - backreferences not possible?
llandale - Fri Nov 13 13:08:10 EST 2009
Back reference? Are you asking to search for the string backslash-digit, looks like \9? If so, use double slash in the regexp
Regexp reSlashDigit = regexp("\[0-9]") I think.
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Re: DOORS regex - backreferences not possible?
doors36677 - Sat Nov 14 11:17:41 EST 2009
To retrieve your pattern match, use:
int start(int n)
int end(int n)
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Re: DOORS regex - backreferences not possible?
SystemAdmin - Mon Nov 16 07:48:59 EST 2009
Thanks a lot for your hints. The problem we have is a bit different, however:
If you got a grouped (bracketed) expression e.g. like "(Item No .*)" you can - at least in most regex flavors - backtrace to the grouped matches the regex engine has found by using "\1" for the first match, "\2" for the second, ...
http://www.regular-expressions.info/brackets.html
This would be a convenient tool for a search / replace e.g. in a numbered list.
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Re: DOORS regex - backreferences not possible?
SystemAdmin - Mon Nov 16 08:57:35 EST 2009 SystemAdmin - Mon Nov 16 07:48:59 EST 2009
Thanks a lot for your hints. The problem we have is a bit different, however:
If you got a grouped (bracketed) expression e.g. like "(Item No .*)" you can - at least in most regex flavors - backtrace to the grouped matches the regex engine has found by using "\1" for the first match, "\2" for the second, ...
http://www.regular-expressions.info/brackets.html
This would be a convenient tool for a search / replace e.g. in a numbered list.
Regexp REXP = regexp2
"(yes[0-9])" string str =
"noyes1yes2yes3yes4no" Skip slMatches = create
int loop = 0
int noMatches = 0
while (REXP str)
{ loop++ put (slMatches, loop, str[match 1]) str = str[end (1) + 1:]
} noMatches = loop loop = 1
while (find (slMatches, loop, str))
{ print loop
" - " str
"\n" loop++
} delete (slMatches)
/Kristian
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Re: DOORS regex - backreferences not possible?
Peter_Albert - Mon Nov 16 09:16:12 EST 2009 SystemAdmin - Mon Nov 16 08:57:35 EST 2009
You could find all matches and put them in a skip list and find them there...
Regexp REXP = regexp2
"(yes[0-9])" string str =
"noyes1yes2yes3yes4no" Skip slMatches = create
int loop = 0
int noMatches = 0
while (REXP str)
{ loop++ put (slMatches, loop, str[match 1]) str = str[end (1) + 1:]
} noMatches = loop loop = 1
while (find (slMatches, loop, str))
{ print loop
" - " str
"\n" loop++
} delete (slMatches)
/Kristian
Regexp URL = regexp
"(HTTP|http|ftp|FTP|file|FILE)://([^ \\),;>\
"]*)" string txt3 =
"The ABC URL is http://www.abc.com; it may be..."
if (URL txt3)
{ print txt3[match 0]
"\n"
// whole match print txt3[match 1]
"\n"
// first section in () print txt3[match 2]
"\n"
// second section in ()
}
Of course this is not what the previous poster proposed, so depending on your actual demands you might use one way or the other.
Regards,
Peter
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Re: DOORS regex - backreferences not possible?
SystemAdmin - Tue Nov 24 04:07:01 EST 2009 Peter_Albert - Mon Nov 16 09:16:12 EST 2009
If you want to refer to grouped options, identified by brackets in the regular expression, you can just use the 'match ' perm as described in the DXL Help:
Regexp URL = regexp
"(HTTP|http|ftp|FTP|file|FILE)://([^ \\),;>\
"]*)" string txt3 =
"The ABC URL is http://www.abc.com; it may be..."
if (URL txt3)
{ print txt3[match 0]
"\n"
// whole match print txt3[match 1]
"\n"
// first section in () print txt3[match 2]
"\n"
// second section in ()
}
Of course this is not what the previous poster proposed, so depending on your actual demands you might use one way or the other.
Regards,
Peter
However, as I have very limited DXL scripting experience, my intention was just to use the "old-school" CTRL-F Find & Replace function with regex backreferences in the replace field. I understood that this is just not implemented in DOORS.
Folks, thank you!
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