有一个 XML TextEdit 字段,它必须在数字之前有一个小数点和一个符号,我知道的模式是:
number : which takes numbers only,no decimal point or sign.
numberDecimal : which takes numbers and decimal point,no sign.
numberSigned : which takes numbers and a sign,no decimal point.
所以我想以某种方式将最后两种模式结合在一起