Regular Expressions 101

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/
^\+(?<PHONENUMBER>\d{8,15})$
/
gm
^ asserts position at start of a line
\+ matches the character + with index 4310 (2B16 or 538) literally (case sensitive)
Named Capture Group PHONENUMBER
(?<PHONENUMBER>\d{8,15})
\d
matches a digit (equivalent to [0-9])
{8,15} matches the previous token between 8 and 15 times, as many times as possible, giving back as needed (greedy)
$ 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.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String