maniootek

RegEx delete between text and end of line

12 posts in this topic

I am trying to delete comments from my sql file but I am not sure how to do it with RegEx. SQL files contains comments which starts from "--" character untill end of line

$SQL_File = FileOpen("query.sql")

$SQL_Query = FileRead($SQL_File)

$SQL_Query_without_comments = StringRegExpReplace($SQL_Query,"(--).*(\n)","")

this code does not delete comments, any idea?

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does not work

please note that "query.sql" looks like this:

 

sql code.PNG

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Would you be able to copy and paste the query.sql file instead of taking a picture?

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#5 ·  Posted (edited)

it works for me.

$SQL_File = FileOpen("file.sql")

$SQL_Query = FileRead($SQL_File)

$SQL_Query_without_comments = StringRegExpReplace($SQL_Query,"(?m)^--\N*","")

$hFile = FileOpen("file2.sql", 2)
FileWrite($hFile, $SQL_Query_without_comments)
FileClose($hFile)

file2.sql has no comment.

Edited by jguinch

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yes, it works but only when line starts from "--" text, but how to make it work also when comment and sql code comes in the same line? example:
 

Quote

 

testcode testcode

testcode testcode --comment

testcode testcode

 

 

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#8 ·  Posted (edited)

6 minutes ago, maniootek said:

yes, it works but only when line starts from "--" text, but how to make it work also when comment and sql code comes in the same line? example:
 

 

$SQL_Query_without_comments = StringRegExpReplace($SQL_Query, "--(.*?)(\N*)", "")

 

Edited by Dgameman1

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now it works, thank you

one day i must learn more about regex, it is very powerfull option

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everything is almost perfect.

any idea how to change regexp pattern to achieve this (with one regex pattern)

comments.PNG.0d67713fe3a4ca66a3a5bd29bef

here is code sample:

$SQL_QUERY = "" & _
"-- comment 1" & @CRLF & _
"-- comment 2" & @CRLF & _
"" & @CRLF & _
"-- comment 3" & @CRLF & _
"" & @CRLF & _
"sqlcodeline1 -- comment 4" & @CRLF & _
"sqlcodeline2" & @CRLF & _
"sqlcodeline3"
msgbox(0,0,$SQL_QUERY)
$newstring = StringRegExpReplace($SQL_Query, "--(.*?)(\N*)", "")
while stringinstr($newstring, @CRLF & @CRLF)
    $newstring = StringReplace($newstring, @CRLF & @CRLF, @CRLF) ;how to avoid this line and include it into above regex pattern?
WEnd
msgbox(0,0,$newstring)

 

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$SQL_QUERY = "-- comment 1" & @CR & _
        "-- comment 2" & @LF & _
        "" & @CRLF & _
        "-- comment 3" & @LF & _
        "" & @CRLF & _
        "" & @CRLF & _
        "" & @LF & _
        "sqlcodeline1 -- comment 4" & @CR & _
        "sqlcodeline2" & @CRLF & _
        "sqlcodeline3"

Global $sCleanQuery = StringRegExpReplace($SQL_QUERY, "(--.*(\r|\n){1,})", @CRLF)
ConsoleWrite($sCleanQuery& @CRLF)

I'm sure there's a regex out there for removing the empty lines but this will remove the comments, regardless of where they're at.

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This will do, but if -- occurs within the SQL statement, then it will explode in flight.

Local $SQL_QUERY = "-- comment 1" & @CR & _
        "-- comment 2" & @LF & _
        "" & @CRLF & _
        "                        -- comment 3" & @LF & _
        "" & @CRLF & _
        "" & @CRLF & _
        "" & @LF & _
        "sqlcodeline1 -- comment 4" & @CR & _
        "sqlcodeline2" & @CRLF & _
        "sqlcodeline3"

Local $sCleanQuery = StringRegExpReplace($SQL_QUERY, "(?m)^\s*--.*\R|^\R|--.*", "")
ConsoleWrite($sCleanQuery& @CRLF)

Note that /* ... */ style SQL comments are ignored here.


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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