Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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"
\d{3,5}
"
gm
\d{3,5}
matches a digit (equal to [0-9])
{3,5} Quantifier — Matches between 3 and 5 times, as many times as possible, giving back as needed (greedy)
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

r"
"
gm

Test String