/^([a-z]+\.?)+[a-z0-9]+$/
what is the meaning of this escape
/^([a-z]+\.?)+[a-z0-9]+$/
what is the meaning of this escape
this expression can cause serious backtracking in some cases, such as
[hint that if the following code is run directly in the browser, it may cause the browser to crash]
/^([a-z]+\.?)+[a-z0-9]+$/.test("a.b.b.b.b.c.d.s.d.s.e.f.sdf.s.sd.df.sd.ss.df.sd.sd.s.d.d.sdffdfsfd.sdfsadfjk.ksdjflkfdj.ksdjflfj.skdfdlfui.lk-");it is recommended that you write this
^(?!.*\.\.)(?=[a-z])[a-z.]+[a-z0-9]+$or
^[a-z]+(?:\.[a-z]+)*[a-z\d]*$ means to start with one or more letters, followed by a decimal point (with or without a decimal point), and then end with a letter or number.
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