PCRE regex to Re2 Regex without negative lookahead -


i trying use regex filter emails addresses in office g suite account email routing. in order so, have created following regex in order following:

  1. accept email address domain "domain.com"
  2. reject 2 of addresses domain.

in order so, created following regex complete said function:

^(?!test|tes2)[a-z0-9._%+-]+@domain.com$

this 1 reject both test@domain.com , tes2@domain.com , accept other combinations said domain.

however, g suite not accept pcre regex, cannot achieve this.

temporarily, created following re2 regex accept email addresses said domain:

(\w|^)[\w.+\-]{0,25}@(domain)\.com(\w|$)

how can expand allow functionality intended since lookarounds not allowed in re2 regex?

because negative lookahead fixed size, it's relatively straightforward expand so. explode in complexity though; i've added comments , spacing readability.

^ ( # not /^t/        [a-su-z0-9._%+-][a-z0-9._%+-]* | # /^t/ not /^te/   t   ([a-df-z0-9._%+-][a-z0-9._%+-]*)? | # /^te/ not /^tes/   te  ([a-rt-z0-9._%+-][a-z0-9._%+-]*)? | # /^tes/ not /^tes[t2]/   tes ([a-su-z013-9._%+-][a-z0-9._%+-]*)? ) @domain.com $

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