Added regexp escaper to utils

lib/common/utils.js

@@ -144,6 +144,15 @@ function normalizeLink(url) {
   return encodeURI(normalized);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+
+var REGEXP_ESCAPE_RE = /[.?*+^$[\]\\(){}|-]/g;
+
+function escapeRE (str) {
+  return str.replace(REGEXP_ESCAPE_RE, '\\$&');
+}
+
+////////////////////////////////////////////////////////////////////////////////
 
 // Zs (unicode class) || 09, 0A, 0D, 0C
 function isWhiteSpace(code) {
@@ -166,6 +175,8 @@ function isWhiteSpace(code) {
   return false;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+
 /*eslint-disable max-len*/
 var BMP_PUNCT_RE = /[\x21-\x23\x25-\x2A\x2C-\x2F\x3A\x3B\x3F\x40\x5B-\x5D\x5F\x7B\x7D\xA1\xA7\xAB\xB6\xB7\xBB\xBF\u037E\u0387\u055A-\u055F\u0589\u058A\u05BE\u05C0\u05C3\u05C6\u05F3\u05F4\u0609\u060A\u060C\u060D\u061B\u061E\u061F\u066A-\u066D\u06D4\u0700-\u070D\u07F7-\u07F9\u0830-\u083E\u085E\u0964\u0965\u0970\u0AF0\u0DF4\u0E4F\u0E5A\u0E5B\u0F04-\u0F12\u0F14\u0F3A-\u0F3D\u0F85\u0FD0-\u0FD4\u0FD9\u0FDA\u104A-\u104F\u10FB\u1360-\u1368\u1400\u166D\u166E\u169B\u169C\u16EB-\u16ED\u1735\u1736\u17D4-\u17D6\u17D8-\u17DA\u1800-\u180A\u1944\u1945\u1A1E\u1A1F\u1AA0-\u1AA6\u1AA8-\u1AAD\u1B5A-\u1B60\u1BFC-\u1BFF\u1C3B-\u1C3F\u1C7E\u1C7F\u1CC0-\u1CC7\u1CD3\u2010-\u2027\u2030-\u2043\u2045-\u2051\u2053-\u205E\u207D\u207E\u208D\u208E\u2308-\u230B\u2329\u232A\u2768-\u2775\u27C5\u27C6\u27E6-\u27EF\u2983-\u2998\u29D8-\u29DB\u29FC\u29FD\u2CF9-\u2CFC\u2CFE\u2CFF\u2D70\u2E00-\u2E2E\u2E30-\u2E42\u3001-\u3003\u3008-\u3011\u3014-\u301F\u3030\u303D\u30A0\u30FB\uA4FE\uA4FF\uA60D-\uA60F\uA673\uA67E\uA6F2-\uA6F7\uA874-\uA877\uA8CE\uA8CF\uA8F8-\uA8FA\uA92E\uA92F\uA95F\uA9C1-\uA9CD\uA9DE\uA9DF\uAA5C-\uAA5F\uAADE\uAADF\uAAF0\uAAF1\uABEB\uFD3E\uFD3F\uFE10-\uFE19\uFE30-\uFE52\uFE54-\uFE61\uFE63\uFE68\uFE6A\uFE6B\uFF01-\uFF03\uFF05-\uFF0A\uFF0C-\uFF0F\uFF1A\uFF1B\uFF1F\uFF20\uFF3B-\uFF3D\uFF3F\uFF5B\uFF5D\uFF5F-\uFF65]/;
 
@@ -174,6 +185,8 @@ function isPunctChar(char) {
   return BMP_PUNCT_RE.test(char);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+
 exports.assign            = assign;
 exports.isString          = isString;
 exports.has               = has;
@@ -186,3 +199,4 @@ exports.arrayReplaceAt    = arrayReplaceAt;
 exports.normalizeLink     = normalizeLink;
 exports.isWhiteSpace      = isWhiteSpace;
 exports.isPunctChar       = isPunctChar;
+exports.escapeRE          = escapeRE;