CODEWITHSUNDEEP
pythonregexregex-negation
bittermelonman
bittermelonman

Reputation: 63

Ignoring a word in regex (negative lookahead)

I'm looking to try and ignore a word in regex, but the solutions I've seen here did not work correctly for me.

Regular expression to match a line that doesn't contain a word

The issue I'm facing is I have an existing regex:

(?P<MovieCode>[A-Za-z]{3,6}-\d{3,5})(?P<MoviePart>[A-C]{1}\b)?

That is matching on Deku-041114-575-boku.mp4.

However, I want this regex to fail to match for cases where the MovieCode group has Deku in it.

I tried (?P<MovieCode>(?!Deku)[A-Za-z]{3,6}-\d{3,5})(?P<MoviePart>[A-C]{1}\b)? but unfortunately it just matches eku-124 and I need it to fail.

I have a regex101 with my attempts. https://regex101.com/r/xqALM2/2

Upvotes: 2

Views: 286

Answers (1)

The fourth bird
The fourth bird

Reputation: 163362

The MovieClose group can match 3-6 chars A-Z and Deku has 4 chars. If that part should not contain Deku, you could use the negative lookahead predeced by repeating 0+ times a character class [A-Za-z]* as it can not cross the -.

To prevent matching eku-124, you could prepend a word boundary before the MovieClose group or add (?<!\S if there should be a whitespace boundary at the left.

Note that you can omit {1} from the pattern.

\b(?P<MovieCode>(?![A-Za-z]*Deku)[A-Za-z]{3,6}-\d{3,5})(?P<MoviePart>[A-C]\b)?

Regex demo

Upvotes: 1

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