Remove string after last occurrence of a character

Question

In my application, I am appending a string to create path to generate a URL. Now I want to remove that appended string on pressing back button.

Suppose this is the s

Answer 1

You can use org.apache.commons.lang3.StringUtils.substringBeforeLast which is null-safe.

From the javadoc:

// The symbol * is used to indicate any input including null.
StringUtils.substringBeforeLast(null, *)      = null
StringUtils.substringBeforeLast("", *)        = ""
StringUtils.substringBeforeLast("abcba", "b") = "abc"
StringUtils.substringBeforeLast("abc", "c")   = "ab"
StringUtils.substringBeforeLast("a", "a")     = ""
StringUtils.substringBeforeLast("a", "z")     = "a"
StringUtils.substringBeforeLast("a", null)    = "a"
StringUtils.substringBeforeLast("a", "")      = "a"

Maven dependency:

    org.apache.commons
    commons-lang3
    3.8