Regular expression contradiction

[Gavin Sinclair]

Folks,

I'm having trouble extracting all the data I want from a string. Please
consider the following results:

irb(main):014:0* xyz.class -> String
irb(main):015:0> xyz.length -> 500
irb(main):016:0> xyz =~ /TRANDATE/ -> 48
irb(main):017:0> xyz =~ /CHECKSUM/ -> 377
irb(main):018:0> xyz =~ /TRANDATE.*CHECKSUM/ -> nil
irb(main):019:0> xyz =~ /TRANDATE.*?CHECKSUM/ -> nil
irb(main):020:0> VERSION -> "1.6.5"

(I want to be using 1.8.0, but I have not solved my recently-described
problem in building it on Cygwin.)

I'm sure you can all see the problem: "TRANDATE" occurs at position 48,
and "CHECKSUM" at position 377. Why on earth does (xyz =~
/TRANDATE.*CHECKSUM/) not return 48?

(xyz.inspect) appears below. Use an editor to collapse into one line to
recreate it.

Thanks,
Gavin

"TRANID\000\000\000\000\000\000\000\000\000ENGYAUS
USR-TNS-210036784\001\002\000\023\000\023\000\000\
010TRANDATE\000\000\000\000\000\000\0002003-03-06,
11:01:26\001\003\000$\000\000\000\000\005INITRANID
\000\000\000\000\000\000\000<)\351\005\000\000#\a\
000\000\005\000\002\000\002\000\000\000\000\000\00
0\000\000\000\000\000\003\000\000\0006\000\000\000
\000\003\000\000\000INITCOU_FST\000\000\003\001
\000\000\000\002\000\000\000\000\000\000\000\000\0
00\000\000\001\001\000\010\000\005\000\000\005VERS
ION\000\000\000\000\000\000\000\000r5_a3\001\002\0
00\001\000\000\000\000\005DUMMY\000\000\000\000\00
0\000\000\000\000\000\000<)\245\006\000\000\300\01
0\000\000\006\000\003\000\f\000\000\000\000\000\f\
000\000\000\000\000\004\000\000\000U\001\000\000
\000\004\000\000\000G003\000\000\000\000\000\000\
000\000\000\003\001\000\000\000\003\000\000\000\00
0\000\000\000\000\000\000\000\001\001\000\010\000\
005\000\000\005VERSION\000\000\000\000\000\000\000
\000r5_a3\001\002\000\n\000\n\000\000\aDPID\000\00
0\000\000\000\000\000\000\000\000\0005240132312\00
1\003\000\001\000\001\000\000\aCHECKSUM\000\000\00
0\000\000\000\0001\001\004\000\n\000\006\000\000\0
05ROLR\000\000\000\000\000\000\000\000\000\000\000
AGLUSR\001\005\000\003\000\000\000\001\005ROLRCONT
EXT\000\000\000\000\001\006\000F\000\000\000\001\0
05ROLRDESC\000\000\000\000\000\000\000\001\a\000\f
\000\f\000\000\aNETRCPTPT\000\000\000\000\000\000D
UKEH"

 

[Daniel Carrera]

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Hash: SHA1

I don't know, but I can tell you that it works correctly in 1.8.0.
Therefore, it must have been a bug.

Folks,

I'm having trouble extracting all the data I want from a string. Please
consider the following results:

irb(main):014:0* xyz.class -> String
irb(main):015:0> xyz.length -> 500
irb(main):016:0> xyz =~ /TRANDATE/ -> 48
irb(main):017:0> xyz =~ /CHECKSUM/ -> 377
irb(main):018:0> xyz =~ /TRANDATE.*CHECKSUM/ -> nil
irb(main):019:0> xyz =~ /TRANDATE.*?CHECKSUM/ -> nil
irb(main):020:0> VERSION -> "1.6.5"

(I want to be using 1.8.0, but I have not solved my recently-described
problem in building it on Cygwin.)

I'm sure you can all see the problem: "TRANDATE" occurs at position 48,
and "CHECKSUM" at position 377. Why on earth does (xyz =~
/TRANDATE.*CHECKSUM/) not return 48?

(xyz.inspect) appears below. Use an editor to collapse into one line to
recreate it.

Thanks,
Gavin

"TRANID\000\000\000\000\000\000\000\000\000ENGYAUS
USR-TNS-210036784\001\002\000\023\000\023\000\000\
010TRANDATE\000\000\000\000\000\000\0002003-03-06,
11:01:26\001\003\000$\000\000\000\000\005INITRANID
\000\000\000\000\000\000\000<)\351\005\000\000#\a\
000\000\005\000\002\000\002\000\000\000\000\000\00
0\000\000\000\000\000\003\000\000\0006\000\000\000
\000\003\000\000\000INITCOU_FST\000\000\003\001
\000\000\000\002\000\000\000\000\000\000\000\000\0
00\000\000\001\001\000\010\000\005\000\000\005VERS
ION\000\000\000\000\000\000\000\000r5_a3\001\002\0
00\001\000\000\000\000\005DUMMY\000\000\000\000\00
0\000\000\000\000\000\000<)\245\006\000\000\300\01
0\000\000\006\000\003\000\f\000\000\000\000\000\f\
000\000\000\000\000\004\000\000\000U\001\000\000
\000\004\000\000\000G003\000\000\000\000\000\000\
000\000\000\003\001\000\000\000\003\000\000\000\00
0\000\000\000\000\000\000\000\001\001\000\010\000\
005\000\000\005VERSION\000\000\000\000\000\000\000
\000r5_a3\001\002\000\n\000\n\000\000\aDPID\000\00
0\000\000\000\000\000\000\000\000\0005240132312\00
1\003\000\001\000\001\000\000\aCHECKSUM\000\000\00
0\000\000\000\0001\001\004\000\n\000\006\000\000\0
05ROLR\000\000\000\000\000\000\000\000\000\000\000
AGLUSR\001\005\000\003\000\000\000\001\005ROLRCONT
EXT\000\000\000\000\001\006\000F\000\000\000\001\0
05ROLRDESC\000\000\000\000\000\000\000\001\a\000\f
\000\f\000\000\aNETRCPTPT\000\000\000\000\000\000D
UKEH"

- --
Daniel Carrera | OpenPGP fingerprint:
Graduate TA, Math Dept | 6643 8C8B 3522 66CB D16C D779 2FDD 7DAC 9AF7 7A88
UMD (301) 405-5137 | http://www.math.umd.edu/~dcarrera/pgp.html
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