用于匹配多行文本的正则表达式

Question

我有一个多行文本，我想匹配单词“描述金额”和一个随机数字之间的文本，并以逗号作为分隔符。
示例输入：

Description Amount
Being the Amount received from above branch in favour of SAF SAF
FOR THE MONTH OF JANUARY-2021.
3,24,500.00

预期输出：

Being the Amount received from above branch in favour of SAF SAF
FOR THE MONTH OF JANUARY-2021.

示例输入：

Description Amount
Being the Amount received from above branch in favour of SD SAF
VALUE SAF OF CHAPAINAWABGANJ AREA FOR THE MONTH OF
JANUARY 2021
9,18,049.00

预期输出：

Being the Amount received from above branch in favour of SD SAF
VALUE SAF OF CHAPAINAWABGANJ AREA FOR THE MONTH OF
JANUARY 2021

输入包含换行符的多个变量编号。我使用了以下正则表达式：

(?<=Description Amount\s)(.*\n.*)

但需要提前improvement.Thanks。

Answer 1

如果数字在行首，您可以使用

(?<=Description Amount\n)(?:(?!\d+,\d).*\n)*

模式匹配

(?<=Description Amount\n)
(?:非捕获组
- (?!\d+,\d).*\n 如果不是以数字、逗号和数字开头，则匹配整行
)* 关闭群组并可选择重复

Regex demo

如果应该至少有一行，您可以将组的量词更改为+

(?<=Description Amount\n)(?:(?!\d+,\d).*\n)+

Regex demo

Answer 2

您可以试试这个正则表达式，它避免了前瞻的多重断言：

(?<=Description Amount\n)(?:.*\n)+?(?=\d+,\d)

RegEx Demo

正则表达式详细信息：

(?<=Description Amount\n)：断言我们在当前位置

Description Amount

(?:.*\n)+?: 匹配任意文本的1行或多行
(?=\d+,\d)：断言我们在当前位置

number,digit

用于匹配多行文本的正则表达式

Regex for matching multiline text

java

regex

multiline