Javascript RegEx:如何匹配所有大于 49 的数字?
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RegEx: How can I match all numbers greater than 49?
提问by Maxx
I'm somewhat new to regular expressions and am writing validation for a quantity field where regular expressions needto be used.
我对正则表达式有点陌生,正在为需要使用正则表达式的数量字段编写验证。
How can I match all numbers greater than or equal to 50?
如何匹配所有大于或等于 50 的数字?
I tried
我试过
[5-9][0-9]+
but that only matches 50-99. Is there a simple way to match all possible numbers greater than 49? (only integers are used)
但这只能匹配 50-99。有没有一种简单的方法来匹配所有可能大于 49 的数字?(仅使用整数)
回答by pimvdb
The fact that the first digit has to be in the range 5-9
only applies in case of two digits. So, check for that in the case of 2 digits, and allow any more digits directly:
第一个数字必须在范围内的事实5-9
仅适用于两位数字的情况。因此,在 2 位数的情况下检查,并直接允许更多位数:
^([5-9]\d|\d{3,})$
This regexp has beginning/ending anchors to make sure you're checking all digits, and the string actually represents a number. The |
means "or", so either [5-9]\d
or any number with 3 or more digits. \d
is simply a shortcut for [0-9]
.
这个正则表达式有开始/结束锚点,以确保您检查所有数字,并且字符串实际上代表一个数字。的|
装置“或”,所以任一[5-9]\d
或任何数量的具有3个或多个数字。\d
只是 的捷径[0-9]
。
Edit:To disallow numbers like 001
:
编辑:禁止数字,如001
:
^([5-9]\d|[1-9]\d{2,})$
This forces the first digit to be not a zero in the case of 3 or more digits.
在 3 位或更多位的情况下,这会强制第一个数字不是零。
回答by Tiago
I know there is already a good answer posted, but it won't allow leading zeros. And I don't have enough reputation to leave a comment, so... Here's my solution allowing leading zeros:
我知道已经发布了一个很好的答案,但它不允许前导零。而且我没有足够的声誉发表评论,所以......这是我的解决方案,允许前导零:
First I match the numbers 50 through 99 (with possible leading zeros):
首先我匹配数字 50 到 99(可能有前导零):
0*[5-9]\d
Then match numbers of 100 and above (also with leading zeros):
然后匹配 100 及以上的数字(也带有前导零):
0*[1-9]\d{2,}
Add them together with an "or" and wrap it up to match the whole sentence:
将它们与“或”一起添加并包裹起来以匹配整个句子:
^0*([1-9]\d{2,}|[5-9]\d)$
That's it!
就是这样!
回答by maerics
Try a conditional group matching 50-99
or any string of three or more digits:
尝试条件组匹配50-99
或三个或更多数字的任何字符串:
var r = /^(?:[5-9]\d|\d{3,})$/
回答by Dzmitry Lahoda
Next matchesall greater or equal to 11100
:
Next 匹配所有大于或等于11100
:
^([1-9][1-9][1-9]\d{2}\d*|[1-9][2-9]\d{3}\d*|[2-9]\d{4}\d*|\d{6}\d*)$
对于大于或等于50
:
^([5-9]\d{1}\d*|\d{3}\d*)$
See pattern and modify to any number. Also it would be great to find some recursive forward/backward operators for large numbers.
查看模式并修改为任何数字。此外,为大数找到一些递归向前/向后运算符也会很棒。
回答by PauGNU
I know this is old, but none of these expressions worked for me (maybe it's because I'm on PHP). The following expression worked fine to validate that a number is higher than 49:
我知道这很旧,但这些表达式都不适合我(也许是因为我使用的是 PHP)。以下表达式可以很好地验证数字是否大于 49:
/([5-9][0-9])|([1-9]\d{3}\d*)/
回答by Kirill Polishchuk
Try this regex:
试试这个正则表达式:
[5-9]\d+|\d{3,}