Regular Expressions 101

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/
^(\d{2}\/\d{2}\/\d{4})
/
gm
^ asserts position at start of a line
1st Capturing Group
(\d{2}\/\d{2}\/\d{4})
\d{2}
matches a digit (equal to [0-9])
{2} Quantifier — Matches exactly 2 times
\/ matches the character / literally (case sensitive)
\d{2}
matches a digit (equal to [0-9])
{2} Quantifier — Matches exactly 2 times
\/ matches the character / literally (case sensitive)
\d{4}
matches a digit (equal to [0-9])
{4} Quantifier — Matches exactly 4 times
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