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Lab regex0: Hint on unnecessary parentheses #994

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Sep 22, 2025
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Lab regex0: Hint on unnecessary parentheses #994

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15 changes: 15 additions & 0 deletions docs/labs/regex0.js
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,13 @@ info =
[ "C" ],
],
},
{
present: String.raw`\(`,
text: "Parentheses are not necessary or clarifying in this regex. Prefer simpler regex expressions.",
examples: [
[ "(cat)" ],
],
},
{
absent: "c",
text: "If you are searching for \"cat\" you need to look for a \"c\"",
Expand Down Expand Up @@ -93,6 +100,14 @@ info =
[ null, "A+B" ],
],
},
{
present: String.raw`\(`,
index: 1,
text: "Parentheses are not necessary or clarifying in this regex. Prefer simpler regex expressions.",
examples: [
[ null, "(A+B+)" ],
],
},
],
expected: [
'cat',
Expand Down