Regular Expressions 101

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/
\d{2}\/[{3}a-zA-Z]\/\d{4}|\d{2}\/\d{2}\/\d{4}
/
g
1st Alternative
\d{2}\/[{3}a-zA-Z]\/\d{4}
\d
matches a digit (equivalent to [0-9])
{2} matches the previous token exactly 2 times
\/ matches the character / literally (case sensitive)
Match a single character present in the list below
[a-zA-Z]
{3} matches the previous token exactly 3 times
a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)
A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)
\/ matches the character / literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
{4} matches the previous token exactly 4 times
2nd Alternative
\d{2}\/\d{2}\/\d{4}
\d
matches a digit (equivalent to [0-9])
{2} matches the previous token exactly 2 times
\/ matches the character / literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
{2} matches the previous token exactly 2 times
\/ matches the character / literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
{4} matches the previous token exactly 4 times
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