How do I fix this error? "Regex: syntax error in subpattern name (missing terminator)"

[bgdatasar]

How do I fix this Regex syntax error in subpattern name missing terminator?

Error in 'rex' command: Encountered the following error while compiling the regex 'my server (?<filerName>[a-z0-9A-Z-]+)': Regex: syntax error in subpattern name (missing terminator) 

[sundareshr]

Try escaping the last - like this \-