Regular Expressions 101

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/
[jackal]
/
gi
Match a single character present in the list below
[jackal]
jackal matches a single character in the list jackl (case insensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
gi

Test String