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Belarusian rule: trying to correct, need help

Example:

на Усебеларускі народны сход

…is detected as a mistake (which it is), and a correction is suggested as follows:

на Усебеларўскі народны сход

…which does not eliminate the mistake and introduces another one.

The correct variant:

на Ўсебеларускі народны сход

…i. e. it is the first letter У that must be changed to Ў (because the preceding one is a vowel).

The rule in question is as follows:

        <rule>
            <pattern>
                <token regexp="yes">.*[уеыаоэяіюё]</token>
                <token regexp="yes">у.*</token>
            </pattern>
            <message>Пасьля галoсных літараў замест 'у' трэба пісаць 'ў': <suggestion><match no="1" /> <match no="2" regexp_match="у(.*)" regexp_replace="ў$1" /></suggestion></message>
            <short>У замест ў</short>
            <example>да ўвагі</example>
            <example correction="да ўвагі"><marker>да увагі</marker></example>
        </rule>
        <rule>

I tried modifying the rule as follows:

        <rule>
            <pattern>
                <token regexp="yes">.*[уеыаоэяіюё]</token>
                <token regexp="yes">у.*</token>
            </pattern>
            <message>Пасьля галoсных літараў замест 'у' трэба пісаць 'ў': <suggestion><match no="1" /> <match no="2" regexp_match="[Уу](.*)" regexp_replace="ў$1" /></suggestion></message>
            <short>У замест ў</short>
            <example>да ўвагі</example>
            <example correction="да ўвагі"><marker>да увагі</marker></example>
        </rule>

Now, the suggestion is as follows:

на ўсебеларускі…

i. e. the right letter У is corrected, but the letter case is not kept.

Then I tried:

        <rule>
            <pattern>
                <token regexp="yes">.*[уеыаоэяіюё]</token>
                <token regexp="yes">у.*</token>
            </pattern>
            <message>Пасьля галoсных літараў замест 'у' трэба пісаць 'ў': <suggestion><match no="1" /> <match no="2" regexp_match="[Уу](.*)" case_conversion="preserve" regexp_replace="ў$1" /></suggestion></message>
            <short>У замест ў</short>
            <example>да ўвагі</example>
            <example correction="да ўвагі"><marker>да увагі</marker></example>
        </rule>

…with the same result.

I’m stuck, because the limit of my understanding of the rules syntax has been reached. Can anyone point to any kind of documentation that can clarify possible ways of improving the rule? And yes, I read tips and tricks, but can’t see any pointer for my case.

Your promblem case is not in the rule as an example. That would help understanding this rule.
You could first make the regular expression case sensitive, and have 2 rules, one for upper, one for lowercase. You could use case_conversion=“startupper” to change case as well.

I tried again:

        <rule>
            <pattern>
                <token regexp="yes">.*[уеыаоэяіюё]</token>
                <token regexp="yes">у.*</token>
            </pattern>
            <message>Пасьля галoсных літараў замест 'у' трэба пісаць 'ў': <suggestion><match no="1" /> <match no="2" regexp_match="[Уу](.*)" case_conversion="preserve" regexp_replace="ў$1" /></suggestion></message>
            <short>У замест ў</short>
            <example>да ўвагі</example>
            <example correction="да ўвагі"><marker>да увагі</marker></example>
        </rule>

It works now as expected. I don’t know why it did not work previously.

I tried to attach a patched version of grammar.xml here but am not allowed to. Well, here’s a Google drive link:

Can someone commit it? As I understand, there’s no maintainer for Belarusian whom I could ask.

I’ve committed it, thanks.