Regular Expressions 101

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/
[B-DF-HJ-NP-TV-Z]{3,}|[AEIOU]{3,}
/
gm
1st Alternative
[B-DF-HJ-NP-TV-Z]{3,}
Match a single character present in the list below
[B-DF-HJ-NP-TV-Z]
{3,} matches the previous token between 3 and unlimited times, as many times as possible, giving back as needed (greedy)
B-D matches a single character in the range between B (index 66) and D (index 68) (case sensitive)
F-H matches a single character in the range between F (index 70) and H (index 72) (case sensitive)
J-N matches a single character in the range between J (index 74) and N (index 78) (case sensitive)
P-T matches a single character in the range between P (index 80) and T (index 84) (case sensitive)
V-Z matches a single character in the range between V (index 86) and Z (index 90) (case sensitive)
2nd Alternative
[AEIOU]{3,}
Match a single character present in the list below
[AEIOU]
{3,} matches the previous token between 3 and unlimited times, as many times as possible, giving back as needed (greedy)
AEIOU
matches a single character in the list AEIOU (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String