Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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/
^(0[1-9]|1[0-2])(\/|-)([0-9])$
/
gm
^ asserts position at start of a line
1st Capturing Group
(0[1-9]|1[0-2])
1st Alternative
0[1-9]
0 matches the character 0 literally (case sensitive)
Match a single character present in the list below
[1-9]
1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)
2nd Alternative
1[0-2]
1 matches the character 1 literally (case sensitive)
Match a single character present in the list below
[0-2]
0-2 matches a single character in the range between 0 (index 48) and 2 (index 50) (case sensitive)
2nd Capturing Group
(\/|-)
1st Alternative
\/
\/ matches the character / literally (case sensitive)
2nd Alternative
-
- matches the character - literally (case sensitive)
3rd Capturing Group
([0-9])
Match a single character present in the list below
[0-9]
{4} matches the previous token exactly 4 times
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
$ asserts position at the end of a line
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.

Regular Expression
No Match

/
/
gm

Test String