const regex = /(^#[0-9A-Fa-f]{6}$)|(^#[0-9A-Fa-f]{3,4}$)|(^#[0-9A-Fa-f]{8}$)/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(^#[0-9A-Fa-f]{6}$)|(^#[0-9A-Fa-f]{3,4}$)|(^#[0-9A-Fa-f]{8}$)', 'gm')
const str = `// good case
#000
#123
#999
#AAA
#aaa
#abc
#FFF
#0000
#9999
#AAAA
#aaaa
#abcd
#FFFF
#ffff
#000000
#456789
#999999
#AAAAAA
#aaaaaa
#abcdef
#FFFFFF
#ffffff
#00000000
#12345678
#99999999
#AAAAAAAA
#aaaaaaaa
#abcdefcc
#FFFFFFFF
#ffffffff
#00123456
//bad case
##
#0
#1
#F
#f
#12
#AB
#ae
#aaaaa
#fffff
#aaaah
#aaaaaaa
#0000000
#ffffhij
#h000000
#aaaaaaai
#000k0123
#asdfasfa
`;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions