Remove extra network separator without regex

onUiLoaded(setupExtraNetworks);

var re_extranet = /<([^:]+:[^:]+):[\d.]+>(.*)/;

var re_extranet_str = '<([^:]+:[^:]+):[\\d.]+>';

var re_extranet =   /<([^:^>]+:[^:]+):[\d.]+>(.*)/;

var re_extranet_g = /<([^:^>]+:[^:]+):[\d.]+>/g;

function tryToRemoveExtraNetworkFromPrompt(textarea, text) {

    function reEscape(s) {

        return s.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");

    }

    var m = text.match(re_extranet);

    var replaced = false;

    var newTextareaText;

    if (m) {

        var extraTextBeforeNet = opts.extra_networks_add_text_separator;

        var extraTextAfterNet = m[2];

        var partToSearch = m[1];

        var foundAtPosition = -1;

        var escapedSeparator = `(?:${reEscape(opts.extra_networks_add_text_separator)})?`;

        var re = new RegExp(escapedSeparator + re_extranet_str, 'g');

        newTextareaText = textarea.value.replaceAll(re, function(found, net, pos) {

        newTextareaText = textarea.value.replaceAll(re_extranet_g, function(found, net, pos) {

            m = found.match(re_extranet);

            if (m[1] == partToSearch) {

                replaced = true;

            return found;

        });

        if (foundAtPosition >= 0 && newTextareaText.substr(foundAtPosition, extraTextAfterNet.length) == extraTextAfterNet) {

        if (foundAtPosition >= 0) {

            if (newTextareaText.substr(foundAtPosition, extraTextAfterNet.length) == extraTextAfterNet) {

                newTextareaText = newTextareaText.substr(0, foundAtPosition) + newTextareaText.substr(foundAtPosition + extraTextAfterNet.length);

            }

            if (newTextareaText.substr(foundAtPosition - extraTextBeforeNet.length, extraTextBeforeNet.length) == extraTextBeforeNet) {

                newTextareaText = newTextareaText.substr(0, foundAtPosition - extraTextBeforeNet.length) + newTextareaText.substr(foundAtPosition);

            }

        }

    } else {

        newTextareaText = textarea.value.replaceAll(new RegExp(text, "g"), function(found) {

            if (found == text) {