StackOverflow2013

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PO
primarykey
Id
11347100
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2012-07-05T15:02:34.540
FavoriteCount
0
LastActivityDate
2017-07-11T03:07:01.053
LastEditDate
2017-07-11T03:07:01.053
LastEditorUserId
1486125
OwnerUserId
1486125
ParentId
641407
PostTypeId
2
Score
76
ViewCount
0
LastEditorDisplayName
text
Body
As Javascript supports <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#special-negated-look-ahead" rel="noreferrer">negative lookahead</a>, one safe way to do it is: Let say you want to do a lookbehind like this <pre><code>(?<!([abcdefg]))m </code></pre> <ol> <li>Reverse the string to match</li> <li>Apply your pattern "reversed" using a lookahead (be careful of the reversed matching expression inside the lookahead, in this case, it stays the same) <pre><code>m(?!([abcdefg])) </code></pre></li> <li>reverse all the matched tokens</li> </ol> Examples: I define the following functions: <pre><code>const reverse = s => s.split('').reverse().join(''); const test = (stringToTests, reversedRegexp) => stringToTests .map(reverse) .forEach((s,i) => { const match = reversedRegexp.test(s); console.log( stringToTests[i], match, 'token:', match ? reverse(reversedRegexp.exec(s)[0]) : 'Ø' ); }); </code></pre> Example 1: Following @andrew-ensley's question: <pre><code>test(['jim', 'm', 'jam'], /m(?!([abcdefg]))/) </code></pre> Outputs: <pre><code>jim true token: m m true token: m jam false token: Ø </code></pre> Example 2: Following @neaumusic comment (match <code>max-height</code> but not <code>line-height</code>, the token being <code>height</code>): <pre><code>test(['max-height', 'line-height'], /thgieh(?!(-enil))/) </code></pre> Outputs: <pre><code>max-height true token: height line-height false token: Ø </code></pre>
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1. POJavascript: negative lookbehind equivalent?
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1. USJBE
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1. USJBE
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