正则表达式匹配字符串中的第一个大写字符

Question

I have a camelcase string eg thisIsCamelcaseString

I'd like to remove the first lowercase characters from from the string.

To achieve this, I think I'm looking for a regular expression that will match from the first capital letter in the string to the end. In this example it would remove this , returning:

IsCamelcaseString

Answer 1

This is one way to achieve it:

 console.log('thisIsCamelcaseString'.replace(/^[az]+/, '')); 

This uses the ^ anchor which matches the string from beginning and then searches for the smallcase letters.

Answer 2

You can use this regex

[A-Z]\S+

Demo

This matches the first capital letter with [AZ] and then any other non-blank characters with \\S+ .

If you want to match only letters you can use

[A-Z][a-zA-Z]+