Regular Expressions 101

Positive Lookbehind(?<=\b)

\ba Unicode word boundary

\d+a Unicode decimal digit, repeated at least once

Positive Lookahead(?=[\s.,])

Character Class[\s.,]

\sa Unicode whitespace character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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.

Search reference

Regular Expression

(?<=\b)\d+(?=[\s.,])

Test String
New

"Hi I am sony. My age 23. This is my email id sony.1510@gmail.com . Hi I am Jessey. My age 20. This is my email id jessey.1996@gmail.com . Hi I am ronald.My age 17 My mail id is ronald.1999@gmail.com"

Regular Expression

Test StringNew

Test String
New