security - Replace Text using powershell -

i having text file following content:

some text text text text somevariable=334,321;   somevariable=234,234; text b = 34 text text

i want replace line

somevariable=334,321;

with

somevariable=10,20;

i can using following way

 $content.replace("somevariable=334,321;", "somevariable=10,20;")

but problem somevariable can , want replace values.

$content.replace("somevariable=?,?", "somevariable=10,20;")

can tell me how can update variable in text file?

use -replace operator, takes regex pattern it's first rhs argument:

$content -replace '(?<=somevariable=)\d+,\d+;','10,20;'

Look