Regular Expressions 101

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/
\B\+91 [0-9]{10}\b
/
gm
\B assert position where \b does not match
\+ matches the character + with index 4310 (2B16 or 538) literally (case sensitive)
91
matches the characters 91 literally (case sensitive)
Match a single character present in the list below
[0-9]
{10} matches the previous token exactly 10 times
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
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