Regular Expressions 101

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/
Batman|Superman
/
g
1st Alternative
Batman
Batman
matches the characters Batman literally (case sensitive)
2nd Alternative
Superman
Superman
matches the characters Superman literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String