本文介绍了计算字符串中逗号个数的正则表达式的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何构建一个正则表达式来匹配包含任意字符但必须包含 21 个逗号的任意长度的字符串?
How can I build a regular expression that will match a string of any length containing any characters but which must contain 21 commas?
推荐答案
/^([^,]*,){21}[^,]*$/
即:
^ Start of string
( Start of group
[^,]* Any character except comma, zero or more times
, A comma
){21} End and repeat the group 21 times
[^,]* Any character except comma, zero or more times again
$ End of string
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