Commonly Used REGular EXpressions

Note

Some regular expressions here are vulnerable to ReDOS attack. Be sure to use them with following conditions:

• server side: Run these expression with libraries such as google/re2, node-re2.
• client side: avoid them, or at least impose necessary limitations on input.

Installation

npm install --save curegex

Usage

include curegex.js or curegex.tw.js, then use:

curegex.get("email").exec(mystring);
curegex.get("email", re2).exec(mystring); /* use `re2` regex engine instead of native RegExp */

set default regular expression engine:

curegex.engine(re2);

Usage with NodeJS

include curegex and use it by scope:

var curegex = require("curegex");
var curegextw = require("curegex").tw;

Resources

• evil regex and rules of thumb: https://stackoverflow.com/questions/12841970/how-can-i-recognize-an-evil-regex
  • per James Davis mentioned, avoid following:
    • nesting quantifiers ( (a+)+ )
    • quantified overlapping disjunctions ( (a|a)+ )
    • quantified overlapping adjacencies ( \d+\d+ )
  • visualize regular expression to spot above cases: https://regexper.com/
• https://en.wikipedia.org/wiki/ReDoS

License

MIT