I have a string and expect it to be changed when calling replaceFirst but it always is the same, not changed.
"there are 400 pictures".replaceFirst(" [0-9]{3}", " a lot of ")
How can it be fixed?
How to replaceFirst in Kotlit by regex?
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1 Answers
You are calling the overload of replaceFirst that takes a String, which replaces the first occurrence of that exact string. Obviously, " [0-9]{3} " does not occur in your string.
To use regex, create a Regex object and pass it to replaceFirst. This will call the overload that takes a Regex:
val replaced = "there are 400 pictures".replaceFirst(Regex(" [0-9]{3} "), " a lot of ")
println(replaced) // there are a lot of pictures
See all the overloads here.
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