Platform and version requirements: JVM (1.0), JS (1.1)

fun String.replaceFirst(
    oldChar: Char, 
    newChar: Char, 
    ignoreCase: Boolean = false
): String

Platform and version requirements: Native (1.3)

fun String.replaceFirst(
    oldChar: Char, 
    newChar: Char, 
    ignoreCase: Boolean
): String

Returns a new string with the first occurrence of oldChar replaced with newChar.

Platform and version requirements: JVM (1.0), JS (1.1)

fun String.replaceFirst(
    oldValue: String, 
    newValue: String, 
    ignoreCase: Boolean = false
): String

Platform and version requirements: Native (1.3)

fun String.replaceFirst(
    oldValue: String, 
    newValue: String, 
    ignoreCase: Boolean
): String

Returns a new string obtained by replacing the first occurrence of the oldValue substring in this string with the specified newValue string.

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)

fun CharSequence.replaceFirst(
    regex: Regex, 
    replacement: String
): String

Replaces the first occurrence of the given regular expression regex in this char sequence with specified replacement expression.

Parameters

replacement - A replacement expression that can include substitutions. See Regex.replaceFirst for details.