Split a multi-line string at the beginning of each line using RegularExpression

Question

I want to replicate the following code using RegularExpression instead of StartOfLine:

In[1]:= StringSplit["line1\nline2\nline3",StartOfLine]//InputForm
Out[1]={"line1\n", "line2\n", "line3"}

In[34]:= StringSplit["line1\nline2\nline3",RegularExpression["^/m"]]//InputForm
Out[34]= {"line1\nline2\nline3"}

How can I get this to work using Mathematica's flavor of regex?

score 7 · Accepted Answer · answered Sep 12 '22 at 06:58

In Mathematica, you set the Regex options with prefix notation.

For multiline mode, you need to prepend your regex expression with "(?m)"

This is in the Details section of RegularExpression:

StringSplit["line1\nline2\nline3", RegularExpression["(?m)^"]] // InputForm

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