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ViewsWhy does my regular expression differ sometimes for the same input
I have this regular expression /[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)/gi for testing a URL but it seems nondeterministic. How is this possible?
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Juan Pablo Isaza
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Your regex is searching for next match. The index where it stopped is stored in urlRegExp.lastIndex
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Juan Pablo Isaza
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Because there's a g flag.
So it will store lastIndex and wait for the next test.
What is RegExp.test:
JavaScript RegExp objects are stateful when they have the global or sticky flags set (e.g., /foo/g or /foo/y). They store a lastIndex from the previous match.
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Juan Pablo Isaza
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