JBoasman opened a new pull request, #1847:
URL: https://github.com/apache/commons-lang/pull/1847
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## Description
This PR resolves
[LANG-1644](https://issues.apache.org/jira/browse/LANG-1644) by introducing a
new method to check if a String is a valid hex number.
**Changes:**
* Added a new method to cleanly validate hexadecimal string formats.
* Included unit tests to verify behavior against valid hex strings (e.g.,
with and without prefixes) and invalid strings (null, empty, non-hex
characters).
**Why:**
Previously, validating a hex string often required parsing it and catching
`NumberFormatException`, which is computationally expensive and poor practice
for control flow. This dedicated validation method improves both performance
and code readability.
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