CODEWITHSUNDEEP
regexregex-lookarounds
Goodies
Goodies

Reputation: 4681

Regex Anything But Letters

I'm working on a Nano color code for Assembly.

I had simply this (only including eax and ebx as there are dozens of them):

color brightcyan "(eax|ebx)"

However, they may be highlighted in other words such as "Hesitate" where "esi" is colored cyan.

Then I used this:

color brightcyan "(\ |\[|\+|\-|\]\*")(eax|ebx)"

Which works, but turns other sybols cyan when I have them in another color (such as [). However, I want it to turn blue ONLY if it's NOT surrounded by alphanumeric characters. Any other symbols should not hinder the coloring, nor should they be colored.

Upvotes: 0

Views: 121

Answers (3)

Taemyr
Taemyr

Reputation: 3437

You have some options.

The simpelest is to use the word boundary marker \b.

\b(eax|ebx)\b

Will match eax or ebx only when it forms a whole word. Note that this does not quite match what you ask for, since it looks for a distinction between word and non-word characters, rather than alphanumeric contra non alphanumeric. So my suggestion would not match in the case of "_eax"

Upvotes: 3

rink.attendant.6
rink.attendant.6

Reputation: 46258

Try using word boundaries:

color brightcyan "\b(eax|ebx)\b"

Upvotes: 3

David Knipe
David Knipe

Reputation: 3454

Try "\b(eax|ebx)\b". This will only match if it's not surrounded by alphanumeric characters or _.

Upvotes: 3

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