ha, ha, capture groups do work! REGEX_REPLACE(Text,"(\\S)[ \\t]*(?:\\r\n|\n)[ \\t]*(\\S)","$1 $2")

Hi, Wondering if REGEX_REPLACE could handle replacing mid-sentence new lines with “”. The solutions I have use look behind or possession (neither supported by RE2), or replacement with capture groups (not supported by REGEX_REPLACE sfaik).