I use this preg_match conditions for对正值、负值和贬损数值进行对比
/^[0-9,-.]{1,50}$/
But when I enter --34.000 it does not show error, when I enter 34...9868 it does not show error, what I want is that it must accept only positive, negative and decimal values.
try this regex ^-?d*.?d+$
i suppose it however cannot be limited to 50 chars
如果需要核对数字,则最好使用<代码>is_全数()。
你们的reg也完全破碎,因为现在它甚至只能接受包含50个狗的扼杀。
如第123号声明所述,如果有某种投入显示值,则有更好的方法可以发现。 如果你要坚持定期表达的话,你可以采取以下做法:
/^-?[0-9]+(?:.[0-9]+)?$/
^)- character (-?); the ? means "not required"[0-9]+)(?:...)?); ?: means "do not capture the subpattern"
.); the . needs to be escaped due to its special function[0-9]+)$)你们需要分开表达,以便它只接受正确地方的特性。 例如:
/^[+-]?([0-9]+,)*[0-9]+(.[0-9]+)?$/
解释这一表述:
<代码>[+-]?: Theeck for a + or - prefix to the number. 它完全是选择性的,但只能是+或-。
([0-9]+,]: 这使一组可选择的 com人数成为可能。 对成千上万的人来说,情况就是如此。
[0-9]+: This requires that the value contains at least some numbers
<代码>([0-9]+)?:最后,这允许有线索的任择术语。
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