Created
March 13, 2015 10:39
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| > /bbb(?=ccc)/.exec("aaabbbccc") // lookahead | |
| ["bbb"] | |
| > /bbb(?=ccc)/.exec("dddbbbeee") | |
| null | |
| > /bbb(?!ccc)/.exec("aaabbbccc") // negative lookahead | |
| null | |
| > /bbb(?!ccc)/.exec("dddbbbeee") | |
| ["bbb"] | |
| > /(?<=aaa)bbb/.exec("aaabbbccc") // lookbehind? | |
| Uncaught SyntaxError: Invalid regular expression: /(?<=aaa)bbb/: Invalid group |
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