regex - How to make an "or" statement in a java Pattern? -

so, , working on program extracts answers html code , stores them array. problem when try make pattern in order separate answers , can't seem make 'or' statement.

the answers stored on html code:

['h','e','l','l','o',' ','w','o','r','l','d'] 

my problem when write string 1 space(' ') not recognized pattern, when write file shows helloworld, no spaces. want pattern simultaneously detects letters , spaces , have no idea of how make 'or' statement in middle of pattern.

this pattern right now, detects letters:

pattern p= pattern.compile("'[a-z]+'"); 

edit: still doesn't work...do think might else? here's part of code( sorry, know it's mess):

// creates string containing letters separated ' '     public static string createstring(bufferedreader in,bufferedwriter         out, string texto) throws ioexception{     stringbuilder sb= new stringbuilder();     pattern p = pattern.compile("'[a-z '']'");           matcher m= p.matcher(texto);             while(m.find()){             sb.append(m.group());         }         return sb.tostring();     } //splits string in order create array nothing     letters public static void toarray(string s, string[] lista, bufferedwriter out) throws ioexception{  lista=s.split("[']");     for(string a:lista){     out.write(a);         system.out.print(a); // check output     }  } 

just add space character class:

public class helloworldregex {     public static void main(final string... args) {         final string regex = "'([a-z ])'";         final pattern pattern = pattern.compile(regex, pattern.case_insensitive);         final string input = "['h','e','l','l','o',' ','w','o','r','l','d']";         final matcher matcher = pattern.matcher(input);         while (matcher.find()) {             system.out.print(matcher.group(1));         }     } } 

output: hello world

test regex online: https://regex101.com/r/el8ut9/3