Regular Expressions 101

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^\+(?:[0-9] ?){6,14}[0-9]$
/
^ asserts position at start of the string
\+ matches the character + with index 4310 (2B16 or 538) literally (case sensitive)
Non-capturing group
(?:[0-9] ?){6,14}
{6,14} matches the previous token between 6 and 14 times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[0-9]
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
Match a single character present in the list below
[0-9]
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
$ 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