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    <p><strong>Write simple parser.</strong></p> <p>Solving this kind of problem by regexp is not right. It's the same as matching brackets - difficult to do with regexp. Regexps are not suitable for nested expressions in general.</p> <p>Try something like that:</p> <pre><code>var parts = src.split(/(\{\{|\}\})/); for (var i in parts) { if (parts[i] == '{{') // starting new (sub) template else if (parts[i] == '}}') // ending (sub) template else // content (or outside) } </code></pre> <p>This is just pseudo code, as I'm in rush now, will update this code to be working...</p> <p><strong>UPDATE (9th August 2011)</strong></p> <pre><code>var NO_TPL = 0, // outside any tpl - ignoring... IN_TPL = 1, // inside tpl IN_LIST = 3; // inside list of arguments function parseWiki(src) { var tokens = src.split(/(\{\{|\}\}|\||=|\[\[|\]\])/), i = -1, end = tokens.length - 1, token, next, state = NO_TPL, work = [], workChain = [], stateChain = []; function trim(value) { return value.replace(/^\s*/, '').replace(/\s*$/, ''); } // get next non empty token function getNext(next) { while (!next &amp;&amp; i &lt; end) next = trim(tokens[++i]); return next; } // go into tpl / list of arguments function goDown(newState, newWork, newWorkKey) { stateChain.push(state); workChain.push(work); if (newWorkKey) { work[newWorkKey] = newWork; } else { work.push(newWork); } work = newWork; state = newState; } // jump up from tpl / list of arguments function goUp() { work = workChain.pop(); state = stateChain.pop(); } // state machine while ((token = getNext())) { switch(state) { case IN_TPL: switch(token) { case '}}': goUp(); break; case '|': break; default: next = getNext(); if (next != '=') throw "invalid"; next = getNext(); if (next == '[[') { goDown(IN_LIST, [], token); } else if (next == '{{') { goDown(IN_TPL, {id: getNext()}, token); } else { work[token] = next; } } break; case IN_LIST: switch(token) { case ']]': goUp(); break; case '|': break; default: work.push(token); } break; case NO_TPL: if (token == '{{') { next = getNext(); goDown(IN_TPL, {id: next}); } break; } } return work; } </code></pre> <p><strong>UNIT TESTS</strong></p> <pre><code>describe('wikiTpl', function() { it('should do empty tpl', function() { expect(parseWiki('{{name}}')) .toEqual([{id: 'name'}]); }); it('should ignore text outside from tpl', function() { expect(parseWiki(' abc {{name}} x y')) .toEqual([{id: 'name'}]); }); it('should do simple param', function() { expect(parseWiki('{{tpl | p1= 2}}')) .toEqual([{id: 'tpl', p1: '2'}]); }); it('should do list of arguments', function() { expect(parseWiki('{{name | a= [[1|two]]}}')) .toEqual([{id: 'name', a: ['1', 'two']}]); }); it('should do param after list', function() { expect(parseWiki('{{name | a= [[1|two|3]] | p2= true}}')) .toEqual([{id: 'name', a: ['1', 'two', '3'], p2: 'true'}]); }); it('should do more tpls', function() { expect(parseWiki('{{first | a= [[1|two|3]] }} odd test {{second | b= 2}}')) .toEqual([{id: 'first', a: ['1', 'two', '3']}, {id: 'second', b: '2'}]); }); it('should allow nested tpl', function() { expect(parseWiki('{{name | a= {{nested | p1= 1}} }}')) .toEqual([{id: 'name', a: {id: 'nested', p1: '1'}}]); }); }); </code></pre> <p>Note: I'm using Jasmine's syntax for these unit tests. You can easily run it using AngularJS which contains whole testing environment - check it out at <a href="http://angularjs.org" rel="noreferrer">http://angularjs.org</a></p>
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    1. COHi ;) thanks for your effort & sorry for late reply but i was quite pressed in time As you've mentioned it's just a pseudo code and it isn't supposed to be functional. What bothers me is how to match the entire template using the method you've suggested. I was thinking more about writing a simple function that counts how many times the opening curly bracket appears, and by comparing this count to the count for the ending one you can easily determine whether you end of template is reached ...
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    2. COBy this pseudocode, you can parse the whole src into object representation, so you can easily change anything, e.g. add property into template, remove, etc... I've just read your question again and maybe this is to much for you... So, instead of building the object representation, you can iterate through this array (`parts`) and do whatever you want - find template you want - change it (by removing / adding string into the array) and then build the updated string, by `parts.join('')` Does it make a sense ?
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    3. COSend some example of template string and operation you need to do with it, I will try to help more than...
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