Regular Expressions 101

Explanation

Pro

Negative Lookbehind(?<!\w)

\wa Unicode word character

Non-Capturing Group(?:(?:\+91|0)\s?)?

?repeats the group contents below at most once:

Non-Capturing Group(?:\+91|0)

1st Alternative\+91

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

91the literal text 91

2nd Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\s?optionally matches a Unicode whitespace character

\d{10}a Unicode decimal digit, repeated exactly 10 times

\ba Unicode word boundary

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

(?<!\w)(?:(?:\+91|0)\s?)?\d{10}\b

New

+91 1234567890, 1234567790, 012345678900, 1234568901112
01234567890