request : find and replace using PowerShell (regex)

[kucingkucing09 Participant Topics: 3 Replies: 11 Points: 58Rank: Member]

hi, sorry i not native english speaker,

i have this example of a part of a js file, let said this text below is in random line, and lines total usually are 100 to 150:

XHTML

{ ID: Player, Lvl: 10, Atk: 30, Def: 50, }

1 2 3 4 5 6

{     ID: Player,     Lvl: 10,     Atk: 30,     Def: 50, }

i like to find and replace only the Atk of the player to 999  using PowerShell batchfile,

the code i want is find:

XHTML

ID: Player, Lvl: /*ignore this text*/, Atk: *,

1 2 3

ID: Player,     Lvl: /*ignore this text*/,     Atk: *,

then replace it with:

PowerShell

ID: Player, Lvl: /*ignore this text*/, Atk: 999,

1 2 3

ID: Player,     Lvl: /*ignore this text*/,     Atk: 999,

because of this specific case, i am sorry if i asked the complete program,

i hope somebody can create for me or give me a clue how to create it,

thanks for read, have a nice day.

[Doug Maurer Participant Topics: 9 Replies: 707 Points: 2,848Rank: Community Hero]

Hopefully this example will help you.

PowerShell

$text = @' { ID: Player, Lvl: 10, Atk: 30, Def: 50, } '@ $text -replace '(?<=Atk: )\d{2,3}','999'

1 2 3 4 5 6 7 8 9 10

$text = @' {     ID: Player,     Lvl: 10,     Atk: 30,     Def: 50, } '@   $text -replace '(?<=Atk: )\d{2,3}','999'

Output

PowerShell

{ ID: Player, Lvl: 10, Atk: 999, Def: 50, }

1 2 3 4 5 6

{     ID: Player,     Lvl: 10,     Atk: 999,     Def: 50, }

Here is how it would look reading from a file.

PowerShell

$text = get-content c:\path\to\jsfile.js -raw $text -replace '(?<=Atk: )\d{2,3}','999'

1 2 3

$text = get-content c:\path\to\jsfile.js -raw   $text -replace '(?<=Atk: )\d{2,3}','999'

[kucingkucing09 Participant Topics: 3 Replies: 11 Points: 58Rank: Member]

thank you for the reply Doug Maurer,

i do not test it the code yet, because I don’t see the “keyword” of “Player” in your code, i assume another data who have “keyword” “Atk” will change to 999 too if i using your code, and i want to edit “Atk” only in “ID: Player” stats,

thank you again for your reply, i really appreciate it

 

[Doug Maurer Participant Topics: 9 Replies: 707 Points: 2,848Rank: Community Hero]

OK, perhaps this example will help more.

PowerShell

$text = @' { ID: NotPlayer, Lvl: 10, Atk: 30, Def: 50, } { ID: Player, Lvl: 10, Atk: 30, Def: 50, } '@ $text -replace '(?s)(?<=ID: Player.*Atk: )\d{2,3}','999'

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

$text = @' {     ID: NotPlayer,     Lvl: 10,     Atk: 30,     Def: 50, } {     ID: Player,     Lvl: 10,     Atk: 30,     Def: 50, } '@   $text -replace '(?s)(?<=ID: Player.*Atk: )\d{2,3}','999'

Output

PowerShell

{ ID: NotPlayer, Lvl: 10, Atk: 30, Def: 50, } { ID: Player, Lvl: 10, Atk: 999, Def: 50, }

1 2 3 4 5 6 7 8 9 10 11 12

{     ID: NotPlayer,     Lvl: 10,     Atk: 30,     Def: 50, } {     ID: Player,     Lvl: 10,     Atk: 999,     Def: 50, }

[kucingkucing09 Participant Topics: 3 Replies: 11 Points: 58Rank: Member]

thanks again for the reply,

i test your code like this :

(Get-Content c:\test.txt) -replace ‘(?s)(?<=ID: Player.*Atk: )\d{2,3}’,’999′ | Set-Content c:\tast.txt

to this (input, the test.txt file):

JavaScript

{ ID: NotPlayer, Lvl: 10, Atk: 30, Def: 50, } { ID: Player, Lvl: 10, Atk: 40, Def: 50, }

1 2 3 4 5 6 7 8 9 10 11 12

{     ID: NotPlayer,     Lvl: 10,     Atk: 30,     Def: 50, } {     ID: Player,     Lvl: 10,     Atk: 40,     Def: 50, }

and the result (tast.txt, new file created) is same with test.txt,

i am sorry for newbie question, but what did i wrong?

[Doug Maurer Participant Topics: 9 Replies: 707 Points: 2,848Rank: Community Hero]

As I stated in my original reply, use -Raw on Get-Content. Let me know if that helps

[kucingkucing09 Participant Topics: 3 Replies: 11 Points: 58Rank: Member]

thank you, now it works,

this the code :

(Get-Content c:\test.txt -raw) -replace ‘(?s)(?<=ID: Player.*Atk: )\d{2,3}’,’999′ | Set-Content c:\tast.txt

now i just need to study what  ‘(?s)(?<=  and \d{2,3}  do,

thank you again!!!

[Doug Maurer Participant Topics: 9 Replies: 707 Points: 2,848Rank: Community Hero]

Good deal. Hopefully this helps with your research.

Single line mode
(?s) for “single line mode” makes the dot match all characters, including line breaks.
This is why it required -Raw, making the entire text one line instead of multi line. It would’ve been much harder to achieve your desired result going line by line.

Positive Lookbehind
(?<=…)
Ensures that the given pattern will match, ending at the current position in the expression. The pattern must have a fixed width. Does not consume any characters.
This is what allowed it to only match when the specified text that came before.

\d matches any numeric character. {2,3} turned that into “match 2 or 3 numeric characters only”

[kucingkucing09 Participant Topics: 3 Replies: 11 Points: 58Rank: Member]

thank you again for the reply.

for the (?s) and \d{2,3} is understandable, but for <=… i google it, and found nothing about it,

do you have a link about it? I quite embarrass always asking the newbie questions

[grokkit Senior Moderator Topics: 10 Replies: 205 Points: 1,118Rank: Community Hero]

Check out the RexEgg page about lookarounds: https://www.rexegg.com/regex-lookarounds.html
and the regular-expression.info page: https://www.regular-expressions.info/lookaround.html

[kucingkucing09 Participant Topics: 3 Replies: 11 Points: 58Rank: Member]

thank you grokkit, now i more (not fully, but more) understand about it

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