Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
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/
^[1-9][2-9](?!00$)[0-9][1-9]?\d+$
/
^ asserts position at start of the string
Match a single character present in the list below
[1-9]
1-9 a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)
Match a single character present in the list below
[2-9]
2-9 a single character in the range between 2 (index 50) and 9 (index 57) (case sensitive)
Negative Lookahead
(?!00$)
Assert that the Regex below does not match
00 matches the characters 00 literally (case sensitive)
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Match a single character present in the list below
[0-9]
0-9 a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
Match a single character present in the list below
[1-9]?
? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy)
1-9 a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)
\d+
matches a digit (equal to [0-9])
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String