Run results for: findMatchGroups old vs new

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
findMatchGroupsOld	1561314.6 Ops/sec
findMatchGroupsNew	6144338.5 Ops/sec

Script Preparation code:

var a = 'abcdefghijklmnopqrstuvwxyz';
var b = 'NOP';

var locale = 'en-US'

/////////////////////////////////////////////////////////////////////////////////////

var BACKSLASH = '\\';
var escapeMap = new Map(
  [
    '\\',
    '^',
    '$',
    '*',
    '+',
    '?',
    '(',
    ')',
    '[',
    ']',
    '{',
    '}',
    '=',
    ':',
    '!',
    '|',
  ].map(char => [char, `${BACKSLASH}${char}`])
);

var escapeRegExp = (searchPhrase) =>
  [...searchPhrase]
    .map(character => escapeMap.get(character) || character)
    .join('');

var findMatchGroupsOld = (
  searchPhrase,
  valueToSearchOn
) => {
  const safeSearchPhrase = escapeRegExp(searchPhrase);
  const searchPhraseRegExp = new RegExp(`(.+)?(${safeSearchPhrase})(.+)?`, 'i');
  const match = valueToSearchOn.match(searchPhraseRegExp);
  if (match) {
    const [, preFind = '', find = '', postFind = ''] = match;
    return [preFind, find, postFind];
  }
  return [valueToSearchOn, '', ''];
};

/////////////////////////////////////////////////////////////////////////////////////

var localeIndexOfLowercase = (value, searchPhrase, locale) => {
  const searchPhraseLowercase = searchPhrase.toLocaleLowerCase(locale);

  return value.toLocaleLowerCase(locale).indexOf(searchPhraseLowercase);
};

var findMatchGroupsNew = (value, searchPhrase, locale) => {
  const index = localeIndexOfLowercase(value, searchPhrase, locale);
  const lastIndex = index + searchPhrase.length;

  if (index === -1) return { preMatch: value, match: '', postMatch: '' };

  return {
    preMatch: value.slice(0, index),
    match: value.slice(index, lastIndex),
    postMatch: value.slice(lastIndex),
  };
};

Tests:

findMatchGroupsOld
findMatchGroupsOld(b, a)
findMatchGroupsNew
findMatchGroupsNew(a, b)