Regular expression for Scan from String

I am trying to pick out three numbers with pattern $number1:number2:number3# from a stream, for instance 8.559509#$-1.686432:-2.427051:-7.281153#$-6.160924:-1.763356:
So far, I use "Scan from String" with Format string "$%f:%f:%f #". However I don't know how to ignore/delete the items before $. Would you like to help me with that? Cheers

You know that your sequence of numbers begins with the $ and ends with the #, so you can separate them into groups first, then separate each number out.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

Similar Messages

Regular Expression for Match Pattern (string) Function

I need to find a variable length string enclosed by brackets and
within a string. Can't seem to get the regular expression right for
the Match Pattern function. I'm able to get the job done using the
Token function, but it's not as slick or tight as I'd like. Does
anybody out there have the expression for this?

Jean-Pierre Drolet wrote in message news:<[email protected]>...
> The regular expression is "\[[~\]]*\]" which means:
> look for a bracket "\[" (\ is the escape char)
> followed by a string not containing a closing bracket "[~\]]*"
> followed by a closing bracket "\]". The match string include the
> brackets
>
> You can also read "Scan from String" with the following format:
> "%[^\[]\[%[^\[\]]" and read the 2nd output. The brackets are removed
> from the scanned string.
Thanks, Jean_Pierre
I did some more experimenting after posting and found that \[.*\] also
works with the match pattern function. Thanks for your input.
sm

Regular expression for middle of string

Bit of background. I'm getting both text (can contain numbers) and data (only numbers) from serial. Since I don't know which I'm receiving and when it starts/ends, I'm making the sender send "textSTART###textSTOP" where "###" is what I want to extract. ### can contain text, numbers, new line, carrige return or whatever.
The same for data&colon; "dataSTART###dataSTOP", where ### contains only numbers.
I think I should use Match Pattern, but I don't know how to make my regular expression.
Any help is appreciated.
Solved!
Go to Solution.

If the string does not contain anything outside these "delimiters" and there are exactly two per string, you could simply use scan strings for tokens. You can also add the "dataSTART/STOP" delimiters to the array to make it universal and look at the beginning of the raw string to determine if you are dealing with a "data" or "text" message.
Here's a quick draft.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
TaggedText.png ‏10 KB

"scan from string" to timestamp doesn't work for 18:00:00 (6PM)

I just found a strange issue in LabVIEW. I hope I'm doing something silly, but I just may have found an unusual bug.
run the snippet below with the following for the input string: 03:00:00,18:00:00,17:00:00
Time converts fine for just about any other time EXCEPT 18:00:00 (6 PM) for which it is returned as 00:00:00 (midnight). If you even add a second to it (18:00:01) you get back the expected result.
Here's hoping I'm not loosing my mind
Matt Holt
Certified LabVIEW Architect
Solved!
Go to Solution.
Attachments:
TimeParseBug.vi ‏11 KB

As annoying as it may seem, this exact scenario is an abuse of the timestamp. A timestamp is meant to be used for absolute times. And that includes a date. As Ravens Fan already pointed out, the 0 seconds since January 1, 1904 GMT is used in all timestamp display routines to mean the canonical invalid timestamp and hence the timestamp control displays the default string indicating the actual date/time format rather than a specific date/time.
If you need an absolute timestamp, for instance because you do want to have a local time indication, although the date is not relevant, adding an offset of 86400 to all values would fix it once and for all. Now the timezone offset can't cause the timestamp to reach 0 ever, even if you reside west of GMT, and it will be fine (until you start to do timestamp arithmetic that involves subtraction of relative timespans, then you would have to make the offset big enough that this will never get an issue). The current date would serve as a nice offset for that, which would be MattH's last suggestion. Nice to see that the Scan from String routine actually does use the passed in timestamp as default value and only replaces the values it is configured to parse.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Wat should be the regular expression for string MT940_UB_*.txt to be used in SFTP sender channel in PI 7.31 ??

Hi All,
What should be the regular expression for string MT940_UB_*.txt and MT940_MB_*.txt to be used as filename inSFTP sender channel in PI 7.31 ??
If any one has any idea on this please let me know.
Thanks
Neha

Hi All,
None of the file names suggested is working.
I have tried using - MT940_MB_*\.txt , MT940_MB_*.*txt , MT940*.txt
None of them is able to pick this filename - MT940_MB_20142204060823_1.txt
Currently I am using generic regular expression which picks all .txt files. - ([^\s]+(\.(txt))$)
Let me know ur suggestion on this.
Thanks
Neha Verma

What is the Scan from string pattern for "match everything" ?

Hello,
Using Scan from string for a while, I know that %s only matches string up to a whitespace. And I also thought %[^] would match everything including whitespaces. But it turned out that it would stop at the closing square brace.
So, what is the real scan pattern for match everything including whitespaces ?

What do you want the Scan From String to end on? Or are you just grabbing the rest of the string? If that is your scenario, then just use the "remaining string" output. It might help if you give a full example of a normal input string and EVERYTHING you want as an output.

Scan from string and extract string between delimiter

Hello,
Basic questions. Is it possible with the scan from string regular expression to extract the string that are within the specified delimiters. Here is an example:
\\Name of folder 1\Name of folder 2\Name of folder 3\File Name
Can the scan from string output the following by specifying the right regular expression:
Name of folder 1
Name of folder 2
Name of folder 3
File Name
I have tried \\\\%s\\%s\\%s\\%s but the %s stops at the first white space.
Thanks,
Michel
Solved!
Go to Solution.

RavensFan suggested the appropriate function for your requirement, however you can also use an alternative, which is 'Spreadsheet String To Array'.
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

Scan from String (arg1) in TKTDS1k2K, Input parameter invalid

After calibration, i am getting a error about Command Requires GPIB controller to be controller in charge, and Scan from String (arg 1) in TKTDs1K2K scalewaveformarray.vi>scope_vppmeaurement.vi
LABVIEW: An input parameter is invalid.
NI-488: Commands Requires GPIB Controller to be in charge .
This program was working before 3rd party calibrated. Failing on first scope measurement. Passes Scope Setup.
Thanks from newbie scheduled a May Class.
Greg Shepherd
RUNNING tEST STAND & lABVIEW 8
Greg

One additional note. I have not had to use Regular Expressions very much, so I'm somewhat of a novice. My FIRST attempt to match either the Verbose or Abbreviated commands from the DSO was as follows:
:WFMP.*:XZE.* $
In words, what I’m trying to say is, “Match any instance of “:WFMP”, followed by any number of any character, followed by “:XZE” followed by any number of any character, and ending with a Space character.” It sure seemed like that should work...but it did not within the VI. That was when I tried other options and found the longer, "A or B" type of match would work, as described in my previous post.
This morning, a buddy sent me links to a couple of websites where you can experiment with Regular Expressions and see if your input is getting matched correctly. By using one of those tools, it appears that my initial attempt IS VALID, but yet, it didn't work within LabVIEW (8.6 for me). I have read some other posts RE: "Bugs" within the way LabVIEW works with Regular Expressions, so maybe this is something similar. But at least I'm up and running by using the long-way.

Regular Expression for match pattern

Hi guys, I need some help.
In one part of my test system, I give to the program a sequence of temperatures, which are numbers separated by a comma. Due to a possible error, the user can forget the coma, and the program gets unexpected values.
For example, "20, 70, -10" is a right value, whereas "20 70, -10" would be a wrong one.
Which regular expression will detect this comma absence?
Thanx in advance.

OK, makes it more difficult (and more fun )
My original version failed also when the space was forgotten. DOH!
Try this version. It get's complicated cause the scan from string likes ignoring spaces... So we change the spaces
Hope this helps
Shane.
PS The ideas given by others are still a better solution, but if you're stuck........
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)
Attachments:
Check input string with commas(array).vi ‏39 KB

How to write regular expression to find desired string piece *duplicate*

Hi All,
Suppose that i have following string piece:
name:ali#lastname:kemal#name:mehmet#lastname:cemalI need
ali
mehmetI use following statement
SQL> select lst, regexp_replace(lst,'(name:)(.*)(lastname)(.*)','\2',1,1) nm from (
2 select 'name:ali#lastname:kemal#name:mehmet#lastname:cemal' as lst from dual
3 );
LST NM
name:ali#lastname:kemal#name:mehmet#lastname:cemal ali#lastname:kemal#name:mehmet#
SQL> But it does not return names correctly. When i change 5th parameter(occurence) of regexp_replace built-in function(e.g. 1,2), i may get ali and mehmet respectiveley.
Any ideas about regexp?
Note : I can use PL/SQL instr/substr for this manner; but i do not want to use them. I need regexp.
Regards...
Mennan
Edited by: mennan on Jul 4, 2010 9:53 PM
thread was posted twice due to chrome refresfment. Please ignore the thread and reply to How to write regular expression to find desired string piece

The approach is to do cartesian join to a 'number' table returning number of records equal to number of names in the string.I have hardcoded 2 but you can use regexp_count to get the number of occurrences of the pattern in the string and then use level <=regexp_count(..... .
See below for the approach
with cte as(
select
'name:ali#lastname:kemal#name:mehmet#lastname:cemal' col ,level lev
from dual connect by level <=2)
select substr(regexp_substr('#'||col,'#name:\w+',1,lev),7)
from cte
/

Regular expression for LOV?

I have a list of strings in an LOV. I tried filtering it by typing in "^disk" in the search bar, which I hope will return a list of strings starting with "disk", but I failed.
Any idea on how to use regular expression for LOVs? Thanks!

HI Buffalo,
i have a select list item in my page1 named :P1_EMPNAME with lov query value
select ename as d, ename as r from emp WHERE EGEXP_LIKE(ename,:P1_SEARCH) or :P1_SEARCH IS NULL
i have a Search text box in my page1 name :P1_SEARCH
When i run the page, by default all the empnames will display in the lov list item
i have given ^buffalo in the text seach item and clicked the submit button ,it shows the Employee buffalo in my list item lov.
If you want all the entries that start with S, search for ^s
End with R, use r$
please try this link http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28424/adfns_regexp.htm
Thanks
Logaa

Request some help, over procedure's performance uses regular expressions for its functinality

Hi All,
        Below is the procedure, having functionalities of populating two tables. For first table, its a simple insertion process but for second table, we need to break the soruce record as per business requirement and then insert into the table. [Have used regular expressions for that]
        Procedure works fine but it takes around 23 mins for processing 1mm of rows.
        Since this procedure would be used, parallely by different ETL processes, so append hint is not recommended.
        Is there any ways to improve its performance, or any suggestion if my approach is not optimized? Thanks for all help in advance.
CREATE OR REPLACE PROCEDURE SONARDBO.PRC_PROCESS_EXCEPTIONS_LOGS_TT
     P_PROCESS_ID       IN        NUMBER,
     P_FEED_ID          IN        NUMBER,
     P_TABLE_NAME       IN        VARCHAR2,
     P_FEED_RECORD      IN        VARCHAR2,
     P_EXCEPTION_RECORD IN        VARCHAR2
    IS
    PRAGMA AUTONOMOUS_TRANSACTION;
    V_EXCEPTION_LOG_ID     EXCEPTION_LOG.EXCEPTION_LOG_ID%TYPE;
    BEGIN
    V_EXCEPTION_LOG_ID :=EXCEPTION_LOG_SEQ.NEXTVAL;
         INSERT INTO SONARDBO.EXCEPTION_LOG
             EXCEPTION_LOG_ID, PROCESS_DATE, PROCESS_ID,EXCEPTION_CODE,FEED_ID,SP_NAME
            ,ATTRIBUTE_NAME,TABLE_NAME,EXCEPTION_RECORD
            ,DATA_STRUCTURE
            ,CREATED_BY,CREATED_TS
         VALUES
         (   V_EXCEPTION_LOG_ID
            ,TRUNC(SYSDATE)
            ,P_PROCESS_ID
            ,'N/A'
            ,P_FEED_ID
            ,NULL
            ,NULL
            ,P_TABLE_NAME
            ,P_FEED_RECORD
            ,NULL
            ,USER
            ,SYSDATE
        INSERT INTO EXCEPTION_ATTR_LOG
            EXCEPTION_ATTR_ID,EXCEPTION_LOG_ID,EXCEPTION_CODE,ATTRIBUTE_NAME,SP_NAME,TABLE_NAME,CREATED_BY,CREATED_TS,ATTRIBUTE_VALUE
        SELECT
            EXCEPTION_ATTR_LOG_SEQ.NEXTVAL          EXCEPTION_ATTR_ID
            ,V_EXCEPTION_LOG_ID                     EXCEPTION_LOG_ID
            ,REGEXP_SUBSTR(str,'[^|]*',1,1)         EXCEPTION_CODE
            ,REGEXP_SUBSTR(str,'[^|]+',1,2)         ATTRIBUTE_NAME
            ,'N/A'                                  SP_NAME
            ,p_table_name
            ,USER
            ,SYSDATE
            ,REGEXP_SUBSTR(str,'[^|]+',1,3)         ATTRIBUTE_VALUE
        FROM
        SELECT
             REGEXP_SUBSTR(P_EXCEPTION_RECORD, '([^^])+', 1,t2.COLUMN_VALUE) str
        FROM
            DUAL t1 CROSS JOIN
                    TABLE
                        CAST
                            MULTISET
                                SELECT LEVEL
                                FROM DUAL
                                CONNECT BY LEVEL <= REGEXP_COUNT(P_EXCEPTION_RECORD, '([^^])+')
                            AS SYS.odciNumberList
                    ) t2
        WHERE REGEXP_SUBSTR(str,'[^|]*',1,1) IS NOT NULL
        COMMIT;
       EXCEPTION
         WHEN OTHERS THEN
         ROLLBACK;
         RAISE;
    END;
Many Thanks,
Arpit

Regex's are known to be CPU intensive specially when dealing with large number of rows.
If you have to reduce the processing time, you need to tune the Select statements.
One suggested change could be to change the following query
SELECT
             REGEXP_SUBSTR(P_EXCEPTION_RECORD, '([^^])+', 1,t2.COLUMN_VALUE) str
        FROM
            DUAL t1 CROSS JOIN
                    TABLE
                        CAST
                            MULTISET
                                SELECT LEVEL
                                FROM DUAL
                                CONNECT BY LEVEL <= REGEXP_COUNT(P_EXCEPTION_RECORD, '([^^])+')
                            AS SYS.odciNumberList
                    ) t2
to
SELECT REGEXP_SUBSTR(P_EXCEPTION_RECORD, '([^^])+', 1,level) str
FROM DUAL
CONNECT BY LEVEL <= REGEXP_COUNT(P_EXCEPTION_RECORD, '([^^])+')
Before looking for any performance benefit, you need to ensure that this does not change your output.
How many substrings are you expecting in the P_EXCEPTION_RECORD? If less than 5, it will be better to opt for SUBSTR and INSTR combination as it might work well with the number of records you are working with. Only trouble is, you will have to write different SUBSTR and INSTR statements for each column to be fetched.
How are you calling this procedure? Is it not possible to work with Collections? Delimited strings are not a very good option as it requires splitting of the data every time you need to refer to.

Scan from string error 85

Hi Everybody,
I'm trying to use LabView to
process some data.  The data, although it was collected via labview,
has been written out to csv file format.  I have been able to
successfully open the file and use the search split string function to
remove the "header" from the data stream.  Now I'm trying to parse the
header to extract some pieces of the info that is there.  I'm trying to
do this with the Scan from String VI.
So
far I've been able to retrieve the Specimen ID from the first line of
the header by setting the format string input of Scan from String as
"Specimen ID ,%s", which works just fine.  Problem is, when I
adjust
the format string to include the next piece of data I want, I
inevitably get an Error 85, which is a failed scan. In fact, I
get an err85 every time I try to extract something from after the
second line. I've attached a VI in which I cut and pasted an
example header string in as a string constant and an example of how I'm
trying to extract the values. I've tried playing around with
spaces and different formats, but get the err85 no matter what I do
(unless I extract the first line). I have a hunch that it has
something to do with the EOL marker, but no idea how to work around it.
A search of posts here show that a lot of people have issues with the
scan from string vi, but nobody I could find had this exact
problem. I've also considered using the spreadsheet spring to
array function, but because I have a mix of commas and EOLs it doesn't
seem to work either. HELP! I really don't want to have to write this
over in VBA/Excel.
Thanks,
Turk
Message Edited by YoungTurk on 07-29-2005 10:36 AM
Attachments:
Scan.vi ‏12 KB

You should probably parse it line by line (See attached, LabVIEW 7.1)..
The attached example shows one possibility to get all the Items and values out. Not all values are strictly numeric so you would need to adapt the code a little bit. (This is just a very rough 1 minute draft).
You might want to cosider to extract all values into a cluster for further processing, Have a look at the example posted in this thread . It can be easily adapted to read the values in the proper format (DBL, I32, Date, String, etc.) depending on the item name.
Good luck!
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ScanMOD.vi ‏30 KB

Wrong use of "Scan From String" function in a while loop?

Hi,
I've got a "Scan From String" function inside a while loop. On the first iteration it converts correctly the number passed by the input string (for example 4) But on the second one it has only spaces (one or more \s) as input string.
I expected to obtain a zero as output (as it does always that it can not make any conversions, as I am supposed to) but indeed, i subtracts 1 from the previous number (according to the number indicated as example I would obtain a 3 as output)
What's wrong with this?
Does the function fails on this case?
The rest of the diagram o the VI is expected to manage a 0 on that situation, like others in which the conversion is not made.
Andres.

I have simplified the VI evading calls to other VIs and trying to reproduce the mistake.
The type of string I introduce to reproduce the mistake is:
clock 3 (30) clock (40)
Forgetting to introduce a number between the second "clock" and the following parenthesis, I would manage it programmatically with code that isn't included.
Then "Scan From String" is supposed to do not make a conversion. But it leaves a 2 as output (in this example)
I have realised, unbelievable but true, that it has matter with the number I substract to the output number (if it were 2, I would obtain 1 as output and so on)
Excluding that, I got the conversion made before as output, 3, on the second time that "Scan From String" executes. But, how can this func
tion as bad?
I am using LV4 on an old PC. I have tried to reproduce it with LV6 and it works. But it isn't desirable for me, I would have to convert a lot of VIs and surely I will find a lot of errors due to the conversion (I have already tried)
Attachments:
EXTCLOCK.VI ‏26 KB

Scan From String White Space

i all,
I'm trying to use Scan From String in order to parse some data coming in from UDP.
Input String: ASCII [00 01 02 03 ... FF]
What I want: s[00 .. 30] d[12], d[34], d[56] leftover s[37 38 39 ... FF]
ATTEMPT1
Format String: %49s%2d%2d%2d
What I get: s[00-09] RUNTIME ERROR!
ATTEMPT2
Format String: %49[^]%2d%2d%2d
What I get: Only allows first output. Will error out if I use any additional outputs from Scan From String
ATTEMPT3
Format String: %49[^(0xFF)]%2d%2d%2d Value in () is ASCII character FF.
What I get: s[00 .. 30] d[12], d[34], d[56] leftover s[37 38 39 ... FF]
It appears as though when I use %##[^] it thinks I'm looking for the ENTIRE string so it will not let me add any more Formatting. If I add a delimiter other than ^ it will run, and it will work presuming that character isn't within the first 49 characters... and I can't guarentee that it won't.
I'm aware I can parse my string using subsets and whatnot... but Scan From String is so elegant. It would be great if %S allowed for white space... or if $##[^] would simply take the first ## characters and allow me to Format after that.
Is there a simple, elegant way to do this? I wish my dataset was only 3-4 outputs. It'd be ideal if I could. Thanks.
Edit:
It might be more helpful if I provide a less abstract example:
I have an ASCII Header (Finite Length String), a Sender IP (Finite Length String), a Timestamp, a Message ID (Finite Length Decimal), A Message in ASCII ( '1' actually means 0x31, not 0x01) And for some ungodly reason... no delimiters.
So I was HOPING %##s%##s%<%H:%M:%s>t%##d (With leftover string to be my message) would work, but if any white space is contained within there... it messes up.

I cannot provide exact strings because the string is actually ASCII characters, most of which aren't displayable.
I have a string where I have:
24 ASCII Characters representing 6x U32 Header Data
13 ASCII characters represening the sender IP (string)
12 ASCII Characters representing the name of the message (String)
12 ASCII Characters representing 3x U32 Data
12 ASCII Characters represneting the name of packet (String)
12 ASCII Characters representing 12x U8 Data
256 ASCII Characters represening 256x U8 Data
etc...
It would be ideal to simply Scan from the string and output the data with the appropriate data types already assigned instead of splitting string and type casting each individualy. But if, for example, my header starts with an ASCII representation of a U32 of 2560(decimal) it would look like this: [00][00][0A][00]. ASCII 0A is considered white space. So my header would only contain 2 ASCII characters instead of the desired 24.

Regular expression for Scan from String

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