java - Rgb、Rgba、Hsl、Hsla 颜色编码的正则表达式模式

Question

我正在为这种字符串寻找一些正则表达式

rgb(r,g,b)
rgba(r,g,b,a)
hsl(h,s%,l%)
hsla(h,s%,l%,a)

与:

r,g,b integer included between 0 and 255, 
a float between 0 and 1 (truncated to first digit after the point)
h integer included between 0 and 359
s,l integer included between 0 and 100

对于 rgb，我写了那些正则表达式:

rgb\(\s*((?:[0-2]?[0-9])?[0-9])\s*,\s*((?:[0-2]?[0-9])?[0-9])\s*,\s*((?:[0-2]?[0-9])?[0-9])\s*\)$

它有效，但它也允许像 rgb(299,299,299) 这样的字符串。我怎样才能使它更有效？rgba、hsl 和 hsla 呢？谢谢

Answer 1

最后我写了这些正则表达式:

    String keywords_color_regex = "^[a-z]*$";
    String hex_color_regex = "^#[0-9a-f]{3}([0-9a-f]{3})?$";
    String rgb_color_regex = "^rgb\\(\\s*(0|[1-9]\\d?|1\\d\\d?|2[0-4]\\d|25[0-5])%?\\s*,\\s*(0|[1-9]\\d?|1\\d\\d?|2[0-4]\\d|25[0-5])%?\\s*,\\s*(0|[1-9]\\d?|1\\d\\d?|2[0-4]\\d|25[0-5])%?\\s*\\)$";
    String rgba_color_regex = "^rgba\\(\\s*(0|[1-9]\\d?|1\\d\\d?|2[0-4]\\d|25[0-5])%?\\s*,\\s*(0|[1-9]\\d?|1\\d\\d?|2[0-4]\\d|25[0-5])%?\\s*,\\s*(0|[1-9]\\d?|1\\d\\d?|2[0-4]\\d|25[0-5])%?\\s*,\\s*((0.[1-9])|[01])\\s*\\)$";
    String hsl_color_regex = "^hsl\\(\\s*(0|[1-9]\\d?|[12]\\d\\d|3[0-5]\\d)\\s*,\\s*((0|[1-9]\\d?|100)%)\\s*,\\s*((0|[1-9]\\d?|100)%)\\s*\\)$";

我正在开发一个供个人使用的库，所以我更喜欢使用正则表达式。我完整地评论了代码。感谢您的提示!