bad-good words with regular expression

Question

I have some list:

$bad_words = ['aaa', 'bbb', 'ccc']
$good_words= ['__aaa', 'bbb==', '#ccc==']

By this lists I'd generate these rules:

$rules = ['/((?<!__)aaa)/', '/(bbb(?!==))/', '/((?<!#)ccc(?!==))/']

Problem: the ccc-rule is not correct (https://regex101.com/r/cC3hY7/1): it must to find strings like #ccc, #ccc-- or ccc== and exclude only strings like #ccc==

How to fix it?

Have you read [this question](http://stackoverflow.com/questions/273516/how-do-you-implement-a-good-profanity-filter) beforehand? — Ja͢ck, Dec 05 '14 at 11:57
Agree with Jack. But is this what you wanted? ((?<!__)aaa)|(bbb(?!==))|(#?ccc(?!==)) — trainoasis, Dec 05 '14 at 11:59
@trainoasis Thanx! But I thik the follow solution is better: it is easier to generate — Dmitry, Dec 05 '14 at 12:44

score 1 · Accepted Answer · answered Dec 05 '14 at 12:15

1

You could simply use (*SKIP)(*F) like below.

    (?:#ccc==|bbb==|__aaa)(*SKIP)(*F)|(?:aaa|bbb|ccc)
#   |<- Strings you don't want ----->|<--strings you want-->

DEMO

answered Dec 05 '14 at 12:15

Avinash Raj

172,303
28
230
274

bad-good words with regular expression

1 Answers1