Regular Expressions 101

^start of line

Group 1((?!\.)[\w-_.]*[^.])

Negative Lookahead(?!\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w-_.]*

*matches any number of characters from the set below:

\wany word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(@\w+)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\w+any word character, repeated at least once

Group 3(\.\w+(\.\w+)?[^.\W])

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

Group 4(\.\w+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

Negated Character Class[^.\W]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\Wany non-word character

$end of line

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.

26 tokens

Regular Expression

^((?!\.)[\w-_.]*[^.])(@\w+)(\.\w+(\.\w+)?[^.\W])$

New

lama.loca.loca123@inca.com

pio_pio@factory.com

carnival666@hellmail.com

la-lalai@gmail.com

//INVALID EMAILS
//spaces at start
 testmail@mail.com

//start with points
.testmail@mail.com

//finish with points
testmail@mail.com.

//spaces into the string
testm ail@mail.com

//Start/finish with any not number|letter char

testmail@mail.com.de
testmail@mail.de.org

Regular Expression

Substitution