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Create _benchmarks/regex-without-lookahead-vs-regex-with-lookahead.md #317

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38 changes: 38 additions & 0 deletions _benchmarks/regex-without-lookahead-vs-regex-with-lookahead.md
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---
title: Regex without lookahead vs Regex with lookahead
setup: |
const attrs = [
'fa',
'has',
'is',
'fa-',
'has-',
'is-',
'fa-home',
'has-text-centered',
'is-primary',
'orientation',
'data-username',
'aria-hidden'
]

const checkAttribute = (attr, regex) => (new RegExp(regex)).test(attr)
const regexWithoutLookahead = '^(is|has|fa)-.+'
const regexWithLookahead = '^(?=(fa|has|is)-).+'
tests:
-
name: Regex without lookahead
code: |
attrs.forEach(attr => {
const check = attr.trim().toLowerCase()
checkAttribute(check, regexWithoutLookahead)
})
-
name: Regex with lookahead
code: |
attrs.forEach(attr => {
const check = attr.trim().toLowerCase()
checkAttribute(check, regexWithLookahead)
})
---