Example of JS string removing consecutive or all repeated characters, js string character instance

Example of JS string removing consecutive or all repeated characters, js string character instance

Remove consecutive duplicate characters from js strings

() And \ number are used together to indicate the Matching content in the parentheses of the repeat regular number, for example: (\ d) \ 1 indicates repeat the first matching block (\ d) it is equivalent to the expression aa if (\ d) matches.

The corresponding values can be: (some) \ 1 * or (some) \ 1 + or (some) \ 1? Indicates repeat the first match to obtain the content any time or at least once or zero.

Var s = "1122333455"; var s1 = s; var c; var cc = s. match (/(\ d) \ 1 +/g); // 11,22, 333,55 of course here () \ 1 * can also be used (because the following is a replacement): 11,22, 333,4, 55 for (var I = 0; I <cc. length; I ++) {c = cc [I]. substring (0, 1); s1 = s1.replace (cc [I], c);} alert (s1); // 12345

Remove all duplicate characters from the js string and sort the final string

Var s = "1234321 abaccc"; var s1 = s. split (""). sort (). join (""); var cc = s1.match (/(.) \ 1 +/g); //, 33, aa, ccc, of course, here () \ 1 * can also be used (because it is replaced below):, 22, 33,4, aa, b, ccc for (var I = 0; I <cc. length; I ++) {c = cc [I]. substring (0, 1); s1 = s1.replace (cc [I], c);} alert (s1); // 1234abc

PS: Let's take a look at js repeat a string n times | string to array

Js repeats a string n times

function repeat(str , n){return new Array(n+1).join(str);}console:repeat("a", 3); //aaa

String to array

var sa="ABCD";var newStr=Array.prototype.join.call(sa); //A,B,C,DnewStr.split(','); //['A','B','C','D']

Summary

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