batch file to open txt replace text save and close - powershell

Question

I understand that this community is for helping people and I'm not one hundred percent how to ask for someone to do a commissioned job or w/e but I'd like a series of batch files for changing certain numbers to a particular number per batch file.
echo off
if exist %application.yml del %application.yml
for /F "delims=" %%l in (%1) do (
set "line=%%l"
set "line=%line:specific text=another word%"
echo/%line%>> %application.yml)'
How would I set this to replace an array of numbers to the set number, I'm sorry I'm a complete idiot with this.
File itself application.yml
product:
# Cntrl alt 1 Mini, 2 m16, 3 scar, 4 m4169, 5 akm, 6 ump,7 sks
discordUsername:
discordPassword:
maxCPUsUsage: 4
shutdownKey: 0x7B
reloadConfigKey: 0x79
screenResolutionX: 1920
screenResolutionY: 1080
playerEsp: true
playerEspColor: 0xFF00FF
playerEspPointSize: 1
radarEsp: true
radarEspColor: 0x0000FF
radarEspPointSize: 2
vehicleEsp: true
vehicleEspColor: 0xff0000
vehicleEspPointSize: 1
vehicleEspHotkey: 0x2D
lootEsp: true
lootEspColor: 0x00FF00
lootAirdropEspColor: 0xffffff
lootEspPointSize: 1
lootEspHotkey: 0x24
redrawTime: 0
reloadDataTime: 2000
aimEnabled: true
aimKey: 0x39
aimFOV: 95
aimFrequency: 6
aimPrecision: 1
aimSpeed: 1
bulletSpeed: 990
aimHitbox: 0
# Key list: https://msdn.microsoft.com/en-us/en-en/library/windows/desktop/dd375731(v=vs.85).aspx
So essentially the number I wish to replace is the bullet speed and it could be multiple numbers from previous changes ect, for example
990
870
400
and if it is any of these instances I wish to replace it with
900
and so on and so forth.
So it searches for any of the possible numbers and changes it to the specified number and save the file under the same file name.
Thanks in advance for any help if I'm being completely honest in the example I dont even know what to change to make it simply replace one number to the other never mind multiple instance searches :)
Once again ty for any advice or help.

Answer 1

The following commented .bat script should do the job, although empty lines are not copied to output file:
#ECHO OFF
SETLOCAL EnableExtensions
rem redirect all output to a brand new file
>application.yml (
rem parse a file (supplied file name %1 must not be equal to "application.yml")
for /F "usebackq delims=" %%l in ("%~1") do (
rem parse each line
for /F "tokens=1* delims=:" %%L in ("%%~l") do (
if /I "%%~L"=="bulletSpeed" (
rem modified line
echo(%%L: 900
) else (
rem original line
echo(%%l
)
)
)
)
BTW, in the original script, you would need Delayed Expansion to make proper reference to variables (re)defined within a parenthesised code block (like a FOR loop body), e.g. as follows:
echo off
SETLOCAL EnableExtensions EnableDelayedExpansion
if exist application.yml del application.yml
for /F "delims=" %%l in (%1) do (
set "line=%%l"
set "line=!line:specific text=another word!"
echo/!line!>>application.yml
)
Resources (required reading):
(command reference) An A-Z Index of the Windows CMD command line
(helpful particularities) Windows CMD Shell Command Line Syntax
(%~L etc. special page) Command Line arguments (Parameters)
(special page) EnableDelayedExpansion
(>>, > etc. special page) Redirection

Answer 2

Regular Expressions are ideal to do this sort of editing.
Aside from findstr's limited capabilities batch is lacking RE support.
This wrapped powershell one liner will do the job either on cmd line or in a batch-file.
powershell -NoP -C "(gc application.yml) -Replace '(?<=bulletSpeed: )\d+','900'|sc application.yml"
It uses a lookbehind assertion to replace any number following bulletSpeed: with 900.
To limit the replacement to one of previous 990, 870, 400 use this:
powershell -NoP -C "(gc application.yml) -Replace '(?<=bulletSpeed: )(990|870|400)','900'|sc application.yml"