i just want to make
str = "a(bcde(dw)d)e"
to
arr = {"a", "(bcde)", "(dw)", "(d)", "e"}
What regEx can i use in str.split()?
PS: Explanations || helpful links welcome.
Examples:
s: "a(bcdefghijkl(mno)p)q" --> [ 'a', '(bcdefghijkl)', '(mno)', '(p)', 'q' ]
s: "abc(cba)ab(bac)c" --> [ 'abc', '(cba)', 'ab', '(bac)', 'c' ]
Go through each parentheses using a counter:
array = [], c = 0;
'abc(cba)ab(bac)c'.split(/([()])/).filter(Boolean).forEach(e =>
// Increase / decrease counter and push desired values to an array
e == '(' ? c++ : e == ')' ? c-- : c > 0 ? array.push('(' + e + ')') : array.push(e)
);
console.log(array)
str = "a(bcde(dw)d)e"
// replace any `(alpha(` by `(alpha)(`
str1 = str.replace(/\(([^)]+)\(/g, '($1)(');
// replace any `)alpha)` by )(alpha)`
str2 = str1.replace(/\)([^(]+)\)/g, ')($1)');
// prefix any opening parenthesis with #--# (just a character string unlikly to appear in the original string)
str3 = str2.replace(/\(/g, '#--#(');
// prefix any closing parenthesis with #--#
str4 = str3.replace(/\)/g, ')#--#');
// remove any double `#--#`
str5 = str4.replace(/(#--#)+/g, '#--#');
// split by invented character string
arr = str5.split('#--#');
console.log(arr); str = "a(bcde(dw)d)e"
console.log(str.split(/[()]/));This looks a little bit weird, but it's like this.
str is string which has a split method. This can take a string or a regular expression as argument. A string will be delimited by " and a RegExp by /.
The brackets [] wrap a character class which means any one of the characters inside. Then inside we have the two parentheses () which are the two characters we are looking for.
I don't think the result you want is possible without modifying the values of the array after the split. But if you want to be able to split the string based on 2 symbols (in this case the brackets '(' and ')') you can do this:
var arr = str.split("(").toString().split(")");
It returns an array with the "words" of the string.
I hope I could help.
Given that the desired output includes characters that aren't in the string, e.g., adding closing or opening parentheses to the substrings in the outer part of the nested parentheses, it will be necessary to make some changes to the individual substrings after they are extracted one way or another.
Maybe something like this:
function getGroups(str) {
var groups = str.match(/(?:^|[()])[^()]+/g)
if (!groups) return []
var parenLevel = 0
return groups.map(function(v) {
if (v[0] === "(") {
parenLevel++
} else if (v[0] === ")") {
parenLevel--
}
v = v.replace(/[()]/,"")
return parenLevel > 0 ? "(" + v + ")" : v
})
}
console.log(JSON.stringify( getGroups("a(bcde(dw)d)e") ))
console.log(JSON.stringify( getGroups("abc(cba)ab(bac)c") ))
console.log(JSON.stringify( getGroups("ab(cd)ef(gh)") ))
console.log(JSON.stringify( getGroups("ab(cd)(e(f(gh)i))") ))
console.log(JSON.stringify( getGroups("(ab(c(d))ef(gh)i)") ))
["a", "(bcde)", "(dw)", "(d)", "e"]?