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Regex Match by Brute Force
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| </head> | |
| <body> | |
| <script> | |
| // ALWAYS put the test regex inside /^()$/. | |
| // Example: /^(REGEX HERE)$/ | |
| var expr = new RegExp(/^((aa)*(c|b)((bb)|(bc)|(bb(cb)*))*|(aa)*a(cb)?((bb)|(bc)|(bb(cb)*))*)$/); | |
| var alpha = ['a', 'b', 'c']; | |
| var maxSize = 5; | |
| var sentences = []; | |
| sentences[0] = ['']; | |
| sentences[1] = alpha.slice(0); // clone array | |
| var k = 1; | |
| while(k < maxSize) { | |
| sentences[k+1] = []; | |
| for(var i in sentences[k]) { // sentences of size k | |
| for(var j in alpha) { | |
| sentences[k+1].push(sentences[k][i] + alpha[j]); | |
| } | |
| } | |
| k++; | |
| } | |
| for(var i in sentences) { | |
| document.body.innerHTML += '<b>Size: '+i+'</b><br>'; | |
| for(var j in sentences[i]) { | |
| var sentence = sentences[i][j]; | |
| if (sentence.match(expr)) { | |
| document.body.innerHTML += '<font color="green">'+sentence+'</font> --- '+count(sentence, alpha)+'<br>'; | |
| } else { | |
| document.body.innerHTML += '<font color="red">'+sentence+'</font> --- '+count(sentence, alpha)+'<br>'; | |
| } | |
| } | |
| } | |
| function countLetter(sentence, char) { | |
| var c = 0; | |
| for(var i in sentence) { | |
| if (sentence[i] == char) { | |
| c++; | |
| } | |
| } | |
| return c; | |
| } | |
| function count(sentence, alpha) { | |
| var r = ""; | |
| for(var i in alpha) { | |
| var c = alpha[i]; | |
| var total = countLetter(sentence, c); | |
| r += "#" + c + " = " + total + " | "; | |
| } | |
| return r; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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