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<p class="MsoPlainText">Hello all<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I discovered an apparent inconsistency between re:run/2 and string:slice/2 last night. I'd appreciate any suggestions on the right way to solve. Best illustrated by this example:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">1> S1="\rDogs".<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">"\rDogs"<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">2> S2="\r\nDogs".<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">"\r\nDogs"<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">3> {match, [{_, To1}]}=re:run(S1, "^\r").<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">{match,[{0,1}]}<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">4> {match, [{_, To2}]}=re:run(S2, "^\r\n").<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">{match,[{0,2}]}<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">5> string:slice(S1,To1).<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">"Dogs"<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">6> string:slice(S2,To2).<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">"ogs"<o:p></o:p></span></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I’d guess this is due to string:slice treating “\r\n” as a single lexeme, whereas re:run treats it as two characters.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">What I’m trying to achieve is consistent behaviour that (a) recognises any newline (CR, LF, CRLF, …) at the start of the string and removes it. I also need a count of the contiguous newlines found.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">As an aside, the now-obsolete string:sub_string/2 does seem to work consistently:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">7> string:sub_string(S1,To1+1).<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">"Dogs"<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">8> string:sub_string(S2,To2+1).<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">"Dogs"</span><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Thanks,<o:p></o:p></p>
<p class="MsoPlainText">Scott.<o:p></o:p></p>
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