javascript正则表达式计算空白字符 [英] javascript regex to count whitespace characters
问题描述
我可以使用javascript正则表达式来计算字符串中第一个文本字符之前的空白字符数吗?我只关心是否有0,1和2 +。
Can I use a javascript regex to count the number of whitespace characters before the first text character in the string? I only care if there are 0, 1, and 2+.
我目前正在使用的解决方案是使用三个正则表达式并使用匹配来确定0,1,或者2+类别(每个都有单独的模式),但我正在寻找更优雅的解决方案。
My current working solution is to have three regexes and just use match to determine the 0,1, or 2+ category(separate pattern for each), but Im looking for a more elegant solution.
甚至可以用正则表达式计算模式吗?我可以使用非贪婪的分组并计算我猜的长度....
Is it even possible to count patterns with regex? I could use a non-greedy grouping and count the length I guess....
推荐答案
" a".match(/^\s{0,2}/)[0].length
此正则表达式匹配字符串开头的0到2个空格字符。
This regex matches between 0 and 2 whitespace characters at the beginning of a string.
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