Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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/
1[10]{16,}
/
gm
1 matches the character 1 literally (case sensitive)
Match a single character present in the list below
[10]{16,}
{16,} Quantifier — Matches between 16 and unlimited times, as many times as possible, giving back as needed (greedy)
10 matches a single character in the list 10 (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.

Regular Expression
No Match

/
/
gm

Test String