Php 货币正则表达式与数值范围匹配

我正在使用这个正则表达式：

^\$?([0-9]{1,3},([0-9]{3},)*[0-9]{3}|[0-9]+)(.[0-9][0-9])?$

此正则表达式与带逗号或不带逗号的美元货币金额匹配

我想用货币格式对1000到2000之间的数字进行匹配

示例：

匹配

$1500.00$2000.0$1100.20$1000

不匹配

$1000.0000$3000$2000.1$4000$2500.50

[$]\([1][[:digit:]]\{3\}\|2000\)\(,[[:digit:]]+\|\)

此表达式定义了此语言：

• 美元后跟1 xyz或2000

• 最后，可选地后跟逗号和1个或多个数字

那么：

/^\$(?:1,?\d{3}(?:\.\d\d?)?|2000(?:\.00?)?)$/

说明：

 ^                        the beginning of the string
----------------------------------------------------------------------
  \$                       '$'
----------------------------------------------------------------------
  (?:                      group, but do not capture:
----------------------------------------------------------------------
    1                        '1'
----------------------------------------------------------------------
    ,?                       ',' (optional (matching the most amount
                             possible))
----------------------------------------------------------------------
    \d{3}                    digits (0-9) (3 times)
----------------------------------------------------------------------
    (?:                      group, but do not capture (optional
                             (matching the most amount possible)):
----------------------------------------------------------------------
      \.                       '.'
----------------------------------------------------------------------
      \d                       digits (0-9)
----------------------------------------------------------------------
      \d?                      digits (0-9) (optional (matching the
                               most amount possible))
----------------------------------------------------------------------
    )?                       end of grouping
----------------------------------------------------------------------
   |                        OR
----------------------------------------------------------------------
    2000                     '2000'
----------------------------------------------------------------------
    (?:                      group, but do not capture (optional
                             (matching the most amount possible)):
----------------------------------------------------------------------
      \.                       '.'
----------------------------------------------------------------------
      0                        '0'
----------------------------------------------------------------------
      0?                       '0' (optional (matching the most
                               amount possible))
----------------------------------------------------------------------
    )?                       end of grouping
----------------------------------------------------------------------
  )                        end of grouping
----------------------------------------------------------------------
  $                        before an optional \n, and the end of the
                           string
----------------------------------------------------------------------
)                        end of grouping

---

使用正则表达式检查某个数字是否在某个范围内，这是一个很好的例子，说明没有为作业使用正确的工具。将字符串转换为数值，并使用

x>=1000&&x完全同意。如果需要，首先使用regex进行验证，以确保您拥有有效的货币数字，然后从中提取数字，转换为int/float并进行范围检查。