Dexter Fryar created LANG-847:
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             Summary: Add an isTrue and isFalse method to StringUtils
                 Key: LANG-847
                 URL: https://issues.apache.org/jira/browse/LANG-847
             Project: Commons Lang
          Issue Type: Improvement
    Affects Versions: 3.x
            Reporter: Dexter Fryar
            Priority: Trivial
         Attachments: StringUtils.java.patchfile, StringUtilsTest.java.patchfile

Implement a common list of true / false statements with a helper method which 
cleans and validates an input string.

StringUtils.isFalse("OFF")
StringUtils.isFalse("false")
StringUtils.isFalse("   false    ")
StringUtils.isFalse("false\n")
StringUtils.isFalse("  false\r\n  ")
StringUtils.isFalse("  0\r\n  ")
StringUtils.isFalse("disable")
StringUtils.isFalse("  disable\r\n  ")
StringUtils.isFalse("disabled")
StringUtils.isFalse("  disabled\r\n  ")
StringUtils.isFalse("N")
StringUtils.isFalse(" N\n  ")
StringUtils.isFalse("NO")
StringUtils.isFalse("NO\r\n  ")

StringUtils.isTrue("ON")
StringUtils.isTrue("true")
StringUtils.isTrue("   true    ")
StringUtils.isTrue("true\n")
StringUtils.isTrue("  true\r\n  ")
StringUtils.isTrue("  1\r\n  ")
StringUtils.isTrue("enable")
StringUtils.isTrue("  enable\r\n  ")
StringUtils.isTrue("enabled")
StringUtils.isTrue("  enabled\r\n  ")
StringUtils.isTrue("Y")
StringUtils.isTrue(" Y\n  ")
StringUtils.isTrue("YES")
StringUtils.isTrue("YES\r\n  ")

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