php - Replace username part in email addresses into asterisks -


how can convert username in email addresses asterisks. first , last letter in username stay , rest replaced (*).

example:

mhyunf@gmail.com

into 

m****f@gmail.com

you can using arounds.

/(?!^).(?=[^@]+@)/

  • (?!^) negative behind. checks if character not preceded start of string. ensures first character not selected.

  • . matches single character.

  • (?=[^@]+@) positive ahead. ensures single character matched followed other @ ( ensured [^@] ) , @

regex demo

example

preg_replace("/(?!^).(?=[^@]+@)/", "*", "mhyunf@gmail.com") =>  m****f@gmail.com

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