Lookbehind javascript regexp

Question

I'm trying to replace some string using pattern but I have no idea how to check if there is dot before string. It should be negative for .some and positive for some

var a = "some.string is replaced  and .some.string5 is not"
a.replace(new RegExp("some", "g"), "replaced")

It should give result replaced.string is replaced and .some.string5 is not THX

Possible duplicate of [javascript regex - look behind alternative?](http://stackoverflow.com/questions/7376238/javascript-regex-look-behind-alternative) — Martin Cup, Dec 12 '16 at 18:42

Martin Cup · Accepted Answer · 2016-12-12T18:37:22.033

2

As Javascript hasn't lookbehinds implemented you can match it normally and replace the preceding character with itself with a backreference: a = a.replace(new RegExp("([^\.]|^)some\.string", "g"), "$1replaced");

edited Dec 12 '16 at 18:37

answered Dec 12 '16 at 17:49

Martin Cup

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Lookbehind is not supported in javascript. – Alex K Dec 12 '16 at 18:20
Thank you. I wasn't aware of that. I edited my answer. – Martin Cup Dec 12 '16 at 18:37

Lookbehind javascript regexp

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