Regular Expressions 101

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/
w|[ehmors]e|[^u]es|duc|[dn]y
/
gm
1st Alternative
w
w matches the character w with index 11910 (7716 or 1678) literally (case sensitive)
2nd Alternative
[ehmors]e
Match a single character present in the list below
[ehmors]
ehmors
matches a single character in the list ehmors (case sensitive)
e matches the character e with index 10110 (6516 or 1458) literally (case sensitive)
3rd Alternative
[^u]es
Match a single character not present in the list below
[^u]
u matches the character u with index 11710 (7516 or 1658) literally (case sensitive)
es
matches the characters es literally (case sensitive)
4th Alternative
duc
duc
matches the characters duc literally (case sensitive)
5th Alternative
[dn]y
Match a single character present in the list below
[dn]
dn
matches a single character in the list dn (case sensitive)
y matches the character y with index 12110 (7916 or 1718) literally (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