import re
example = "gz15gr123da1az4gr1sd23f168zgre4r6z"
re.sub("(\d)gr", r"\1", example)
输出
gz15123da1az41sd23f168zgre4r6z
解释
re.sub 函数采用三个参数：第一个参数是模式，第二个参数是替换，最后一个参数是字符串本身。 (\d)gr 选择包含数字后跟 gr 的部分，然后将其替换为数字 (\d) 本身（删除 gr代码>部分）。
If I understand your question correctly, what you need is regex:
import re
example = "gz15gr123da1az4gr1sd23f168zgre4r6z"
re.sub("(\d)gr", r"\1", example)
Output
gz15123da1az41sd23f168zgre4r6z
Explnatation
The re.sub function takes three arguments: the first argument is a patter, the second one the replacement, and the last of is the string itself. (\d)gr selects the parts that contain a number followed by gr, then replaces it with the number (\d) itself(removing the gr part).
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如果我正确理解你的问题，你需要的是正则表达式：
输出
解释
re.sub函数采用三个参数：第一个参数是模式，第二个参数是替换，最后一个参数是字符串本身。(\d)gr选择包含数字后跟gr的部分，然后将其替换为数字 (\d) 本身（删除gr代码>部分）。If I understand your question correctly, what you need is regex:
Output
Explnatation
The
re.subfunction takes three arguments: the first argument is a patter, the second one the replacement, and the last of is the string itself.(\d)grselects the parts that contain a number followed bygr, then replaces it with the number (\d) itself(removing thegrpart).