我想用 RegEx 匹配 X 和 Y 之间的数字。这可能吗？
([0-9]+) 将匹配任何数字，我该怎么做才能匹配 110 和 2234 之间的数字？
请您参考如下方法:
根据 Generate a Regular Expression to Match an Arbitrary Numeric Range ，并在 Regex_For_Range 为您的示例生成这样的正则表达式后:
\b0*(1[1-9][0-9]|[2-9][0-9]{2}|1[0-9]{3}|2[01][0-9]{2}|22[0-2][0-9]|223[0-4])\b
会做的伎俩。
该过程将是(仍然遵循该正则表达式生成器):
First, break into equal length ranges:
110 - 999
1000 - 2234
Second, break into ranges that yield simple regexes:
110 - 199
200 - 999
1000 - 1999
2000 - 2199
2200 - 2229
2230 - 2234
Turn each range into a regex:
1[1-9][0-9]
[2-9][0-9]{2}
1[0-9]{3}
2[01][0-9]{2}
22[0-2][0-9]
223[0-4]
Collapse adjacent powers of 10: 1[1-9][0-9] [2-9][0-9]{2} 1[0-9]{3} 2[01][0-9]{2} 22[0-2][0-9] 223[0-4]
Combining the regexes above yields:
0*(1[1-9][0-9]|[2-9][0-9]{2}|1[0-9]{3}|2[01][0-9]{2}|22[0-2][0-9]|223[0-4])
Next we'll try factoring out common prefixes using a tree:
Parse into tree based on regex prefixes:
. 1 [1-9] [0-9]
+ [0-9]{3}
+ [2-9] [0-9]{2}
+ 2 [01] [0-9]{2}
+ 2 [0-2] [0-9]
+ 3 [0-4]
Turning the parse tree into a regex yields:
0*(1([1-9][0-9]|[0-9]{3})|[2-9][0-9]{2}|2([01][0-9]{2}|2([0-2][0-9]|3[0-4])))
We choose the shorter one as our result.
\b0*(1[1-9][0-9]|[2-9][0-9]{2}|1[0-9]{3}|2[01][0-9]{2}|22[0-2][0-9]|223[0-4])\b
