Regex non-capturing group

Robot Framework
1

Hallo Community,
does anybody know if Robotframework Core does support Regex with the non-capturing group syntax.

Example:
(?: # some regex expression )

I used a regex construct but it did not work unless I removed the “?:” above.

Does anybody know how to escape this expression?

2

Hi,

I can tell you that I have some fields and Regex likes this that works well:

VAR    ${period}   From  dd/mm/yyyy at hh:mm to dd/mm/yyyy at hh:mm
${end}    Get Regexp Matches    ${period}    (?<=to )\\d{2}/\\d{2}/\\d{4} at \\d{2}:\\d{2}

Or this:

VAR    ${maildata}    Your temporary code is:1a2b
${code}    Get Regexp Matches    ${maildata}    (?<=Your temporary code is:)(\\w+)

And this get me the intended value (end date-time) or code to work with.
Hope this helps.

Regards.
Charlie

1 Like
4

How to specify multiple non capturing groups? Are more than one non capturing groups supported?

e.g.

(?<=skip this #1)(capture this)(?<=skip this #2)

${Match}       Get Regexp Matches     ${line}       (?<=:\\s)([\\w]+)(?<=\\sis)
#line = : Hello is
#I want to capture "Hello" while mentioning that ignore the \\sis

Thanks,

Narendra Bhagwat

5

Hi,

In this case you should use both Lookbehind (?<=caracters) and Lookeahead (?=caracters):

Standard regex expression:

(?<=:\s)[\w]+(?=\sis)

So here you’re searching for a string with letters/numbers, that has behind/before : and ahead/after is

RF escaped regex expression:

VAR    ${string}    : Hello is
${result}    Get Regexp Matches    ${string}    (?<=:\\s)[\\w]+(?=\\sis)

As another example if you need multiple groups/non-capturing groups, you could use something like this to get ‘Hello’ and ‘Goodbye’:

: Hello is not Goodbye

Regex : 
(?<=:\s)[\w]+(?=\sis)|(?<=not\s)[\w]+

Here you’ll get in RF a result variable as a list with two items:

image

Regards.
Charlie