extractCaptureGroup

[JVM]
open fun extractCaptureGroup(s: String, regex: String, captureGroupNumber: Int): String

This returns the specified capture group from s.

the value of the specified capture group in the first match of the regex, or null if the s doesn't match the regex

JVM


s	the source String
regex	the regular expression, see java.util.regex.Pattern, which matches part of s.
captureGroupNumber	the number of the capture group (0 for entire regex, 1 for first capture group, 2 for second, etc.)


RuntimeException	if trouble, e.g., invalid regex syntax