const regex = new RegExp('(?<!foo.{0,1000})bar(?!.*foo)', 'gm')
const str = `bar //true
,bar, //true
,,bar,, //true
barbar //true
,bar,bar, //true
,,bar,,bar,, //true
barbarbar //true
,bar,bar,bar, //true
,,bar,,bar,,bar,, //true
foo //false
,foo, //false
,,foo,, //false
foobar //false
,foo,bar, //false
,,foo,,bar,, //false
barfoo //false
,bar,foo, //false
,,bar,,foo,, //false
foofoo //false
,foo,foo, //false
,,foo,,foo,, //false
foobarbar //false
,foo,bar,bar, //false
,,foo,,bar,,bar,, //false
barfoobar //false
,bar,foo,bar, //false
,,bar,,foo,,bar,, //false
barbarfoo //false
,bar,bar,foo, //false
,,bar,,bar,,foo,, //false
barfoofoo //false
,bar,foo,foo, //false
,,bar,,foo,,foo,, //false
foobarfoo //false
,foo,bar,foo, //false
,,foo,,bar,,foo,, //false
foofoobar //false
,foo,foo,bar, //false
,,foo,,foo,,bar,, //false
foofoofoo //false
,foo,foo,foo, //false
,,foo,,foo,,foo,, //false`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions