regn
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
regn
AddWæs seó eá for regna (réna, v. l.) micelnesse swíðe réðe fluuius prae inundantia pluuiarum ripas suas transierat, Bd. 3, 24; Sch. 309, 16. Ic wénde þá triów for miclum wǽtan and regnum swá heáge weóxon. Ðá sægde se bisceop nǽfre in þǽm londum regnes dropa ne cwóme arbores . . . cum dicerem frequentibus imbribus in tantum creuisse, acerdos affirmabat nunquam in his locis pluuiam adire, Nar. 28, 2-5. Hrægnas pluuias, Ps. L. 104, 32. v. tíd-regn.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.