/\ATo\:\s+(.*)/
Also, how do you work it out, what’s the approach?
/\ATo\:\s+(.*)/ Also, how do you work it out, what’s the approach?
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You start from left and look for any escaped (ie
\A) characters. The rest are normal characters.\Ameans the start of the input. SoTo:must be matched at the very beginning of the input. I think the:is escaped for nothing.\sis a character group for all spaces (tabs, spaces, possibly newlines) and the+that follows it means you must have one or more space characters. After that you capture all the rest of the line in a group (marked with( )).If the input was
the capture group would contain
"progo@home"