Field validation formulas... and folder creation via CSOM

Lately i'm working on sandbox solutions, it seems customer prefers OOB solutions. Indeed i created (inspired from some blog posts written by people who knows things for real) those formulas for phone number and email: Phone (+39 080-1234567): =AND( (FIND("+";[Phone];1)=1); (ISNUMBER(VALUE(MID([Phone];2;FIND(" ";[Phone];1)-2)))); (ISNUMBER(VALUE(MID([Phone];FIND("...

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