Regular Expressions 101

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/
[\d.]+GHz
/
ig
Match a single character present in the list below
[\d.]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\d matches a digit (equivalent to [0-9])
. matches the character . with index 4610 (2E16 or 568) literally (case insensitive)
GHz
matches the characters GHz literally (case insensitive)
Global pattern flags
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
ig

Test String