[CentralOH] Regex Question

[Len Jaffe]

[^!#] will match whitespace, as will .*.

You're probably going to need to delve into zero-width look-aheads and
look-behinds.

On Mon, Sep 29, 2014 at 10:46 AM, Joshua Kramer <joskra42.list at gmail.com>
wrote:

> Hello All,
>
> I have an interesting challenge with a regex.  I need to match any line
> that:
>     Does not contain a !  or a # as the first non-whitespace character
>     Contains the word 'if', but not the string "-if" or the string "ifdef"
>
> So this should match:
>
> "    if a=1 then"
>
> These should not match:
>
> "!* If this code runs..."
> "#ifdef something"
> "    !If this code runs..."
>
> Here's the regex I have so far:
>
> ^\s*[^!#].*[^-]if[^a-zA-Z0-9_].*
>
> This works for the most part, except it is matching lines that begin with
> any number of whitespaces and an exclamation point.  So it incorrectly
> matches this, for example:
>
> "      ! if you have a comment..."
>
>
> This is undesired behavior.
>
> What am I missing here?
>
> Thanks!
> -JK
>
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>
>


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