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replace underscores with hyphens in a string

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Hi guys,

I need to transform a filename like one_test to one-test and just_another_test to just-another-test. I'm just getting started with PCRE and this is beyond my new found skills

$str = $const . 'function.' . $o . '.html' ;

need to check $o for filenames like one_file becomes one-file and just_another_file becomes just-another-file

Thanks in advance...

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