Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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~
[0-9]{2}/[0-9]{2}/[0-9]{4}
~
gm
Match a single character present in the list below
[0-9]{2}
{2} Quantifier — Matches exactly 2 times
0-9 a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
/ matches the character / literally (case sensitive)
Match a single character present in the list below
[0-9]{2}
{2} Quantifier — Matches exactly 2 times
0-9 a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
/ matches the character / literally (case sensitive)
Match a single character present in the list below
[0-9]{4}
{4} Quantifier — Matches exactly 4 times
0-9 a single character in the range between 0 (index 48) and 9 (index 57) (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