Regular expressions, builing up a simple expression for a search

Hello All,

I am stuck with a regular expression and I would appreciate your help. I want to list some specific cases from some simulations. For instance, I have the following case names:

...

wkxr4_75_ind1_350_0.inf

wkxr4_75_ind4_400_0.inf

swxr4_75_ind3_420_0.inf

wkxr4_75_cap1_350_0.inf

stxr4_75_cap2_400_0.inf

wkxr4_75_cap5_420_0.inf

...

Until now I just needed to do something simple, like getting the cases that started with sw, or wk, or st:

^(sw|wk|st)

However, now I want to find of those cases, the ones that also contain 400_0 and 420_0

I undertand the $ character can be used to give me the end, and it could work with something like this, right?

$(400_0.inf|420_0.inf)

The complete expression would be something like this below. However, I tried several different variations without success. For instance using [a-z_]+. etc.

'^(sw|wk|st) 'something here?' $(400_0.inf|420_0.inf)'

Thanks in advance!

Best regards,

Adriel Perez

Answer 1

[Adam Danz]

https://regex101.com/

I recommend that site when building regular expressions.

   ^(sw|wk|st).+(400_0\.inf|420_0\.inf)$
%  ^ start    ^^      ^          ^     ^
%             ^^      ^          ^     ^ end
%             ^^ anything in between
%                     ^ .........^ escape characters (\) for decimal points

[Guillaume]

Another way to write the end of that regular expression would be:

'^(sw|wk|st).+4[02]0_0\.inf$'

And the .+ could be .* depending on whether or not you want something between the two expressions.

[Adriel Perez Tellez]

That worked great.

Cheking out https://regex101.com/

Thanks!