Regular Expressions 101

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/
\b0[0-9]{9,10}\D
/
gmi
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
0 matches the character 0 with index 4810 (3016 or 608) literally (case insensitive)
Match a single character present in the list below
[0-9]
{9,10} matches the previous token between 9 and 10 times, as many times as possible, giving back as needed (greedy)
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case insensitive)
\D matches any character that's not a digit (equivalent to [^0-9])
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)
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gmi

Test String