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Regex behavior in Cf3

Cfengine Help: Who's going to promise this - Forums Fubar
(12 lines)		 Cfengine Help: hostname or DNS problem
(41 lines)
Sep 1, 2010
Daniel V. Klein
Daniel V. Klein
 
Mark-

I'm Cc'ing this to the mailing list so that the rest of user community can
chime in (since I may be barking up the wrong tree).  This is in response
to the many bug reports I see which involve regex's (that are in fact, not
bugs but misunderstandings as to what are regex characters).  It's a
thought that came to me in the "if I had it all to do over" frame of mind,
and maybe you'll find a way to incorporate it in the future somehow... 
consider it a long-term feature-request.  It may be possible to do this
with a control promise, too, where we change the overall behavior of regex
interpretation.

The biggest problem is that to a n00b, it is not always clear where the
regex is, or when a regex is expected.  Currently, wherever a regex is
allowed, the string contains the regex (which may or may not contain regex
characters, and which looks like any other string).  So, you get code that
looks like this:

 bundle edit_line comment_lines_matching
   {
   vars:
 
     "regexes" slist => { "one.*", "two.*", "four.*" };
 
   replace_patterns:
 
    "^($(regexes))$"
       replace_with => comment("# ");
 
    ".*foo.*"
       replace_with => comment("# ");
   } 
 
 bundle agent wintest
 {
 vars:
 
   "dim_array"
      int => 
readstringarray("array_name","/tmp/array","#[^\n]*",":",10,4000);
 
 
 files:
   "c:\tmp\file"
     delete => nodir,
     pathtype => "literal";	# force literal string interpretation
 
 
   "C:/windows/tmp/f\d"
     delete => nodir,
     pathtype => "regex";	# force regular expression interpretation
 }

I propose introducing a new semantic distinction with a control promise and
two new syntactic elements.

0) The default (current) behavior is unchanged, but a new behavior can be
introduced with the control promise "explicit_regex"
1) With the new behavioral mode, a quoted string like "foo.*" is just a
string containing 5 characters ("foo" a literal '.' and a literal '*').
2) Also with the new behavioral mode, an explicit regex string like /foo.*/
or r"foo.*" or r'foo.*' is a string that contains a regex.  The r"str"
notation is a convenience, to spare lots of backslashes in filenames.

This means that the above code (with the appropriate control variable) will
now look like this:

 body common control
 {
    explicit_regex => "true";
 }
 
 bundle edit_line comment_lines_matching
   {
   vars:
 
     "regexes" slist => { "one.*", "two.*", "four.*" };
 
   replace_patterns:
 
    /^($(regexes))$/		# The slist contains strings, but they are
expanded and then the result is interpreted as a regex
       replace_with => comment("# ");
 
    /.*foo.*/
       replace_with => comment("# ");
   } 
 
 bundle agent wintest
 {
 vars:
 
   "dim_array"
      int => 
readstringarray("array_name","/tmp/array",/#[^\n]*/,":",10,4000);	# 3rd
parameter is an explicit regex, 4th param is a string (both could be
regex's)
 
 
 files:
   "c:\tmp\file"
     delete => nodir	;	# literal string interpretation is automatic,
because the string is simple and not a regex string
 
 
   r"C:/windows/tmp/f\d"
     delete => nodir;	# regular expression interpretation is
automatic, because the string is a regex
 }

The biggest problem now is that a user may specify a file as "file.ext",
and not realize that this can also select a file named "filesext" or
"file-ext" or "file_ext" (and to get just the one file, they need to say
"file\.ext").

I also just saw user report where
 	perms => system("0400", "DOMAIN+USER", "sysmgt")

didn't work as expected, and that it needed to be
 	perms => system("0400", "DOMAIN\+USER", "sysmgt")


I think it would be so much clearer if the regex/string distinction was
explicit.  What do you all think?  I'd be willing to help implement this,
of course.

-Dan
Reply
Tags: bugfactregexinvolve
Messages in this thread
Regex behavior in Cf3
reply Re: Regex behavior in Cf3
(18 lines) Sep 3, 2010 18:19
reply Re: Regex behavior in Cf3
(27 lines) Sep 3, 2010 18:33
reply Re: Regex behavior in Cf3
(34 lines) Sep 3, 2010 18:37
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Ref. 324 * Geoinformationszentrum
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REGEX - Long running thread - stuck at RE.java
Hi,

 

We are facing high CPU usage in our application hosted on Tomcat. After
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Please advice.

 

Below is the info from thread dump:

 

TP-Processor5396" daemon prio=10 tid=0x022cff28 nid=0x1f91b runnable
[0x4dcfb000..0x4dcffc70]

            at org.apache.regexp.RE.matchNodes(RE.java:860)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchNodes(RE.java:1376)

            at org.apache.regexp.RE.matchAt(RE.java:1448)

            at org.apache.regexp.RE.match(RE.java:1498)

            at org.apache.regexp.RE.match(RE.java:1468)

            at org.apache.regexp.RE.match(RE.java:1561)

            at
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

            at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:290)

            at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:206)

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org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:233)

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org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:175)

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org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:128)

            at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:102)

            at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:109)

            at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2
86)

            at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)

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org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)

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org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:
697)

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org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.
java:889)

            at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.java:690)

            at java.lang.Thread.run(Thread.java:595)

 

 

Here is the regex related code in our application :

 

        try{

          RE r = new
RE("^[\\w\\-]+(\\.)?[\\w\\-]+@[\\w\\-\\.]+(\\.([a-z]){2,4})$");

          RE r1 = new RE("^\\w{5,65}$");

          match = r.match(userID);

          if(!match)

            match = r1.match(userID);

 

        }catch(Exception ex){

            throw new BusinessException(ex);

        }

 

Any thoughts???? 
 
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