REGULAR EXPRESSION

REGULAR EXPRESSION

1. Create REGEXP

   • var re1 = new RegExp("abc");
   • var re2 = /abc/;
   • Use cach 2: khi gap dau phai: var re3 = /abc\+/;

2. Method

   • .test()
     • string container match of pattern?
     • return true - contain, false - not contain
     • console.log(/abc/.test("abcde");
       • Kiem tra trong chuoi "abcde" co abc ko?
       • //true
   • exec()
     • return null - not match, obj with info aboutn match - contain
     • var match = /\d+/exec("one two 100"); console.log(match); console.log(match.index)
   • .match()
     • Chn # exec()
     • console.log("one two 100".match(/\d+/)); //["100"]
   • replace()
     • replace part of the string with another string
     • console.log("papa".replace("p", "m"));

3. Repeat part of pattern

   • put (+) after sth in regexp
     • --> repeated more than once
     • console.log(/'\d+'/.test("'123'"));
   • put (*)
     • may occur zero time
     • console.log('\d*'/\.test(" '123' ")); //true
     • console.log('\d*/\.test(" '' ");
   • put ?
     • may occur 0 or 1 time
     • var neighbor = /neoghbo?r/; console.log(neighbor.test("neighbour")); console.log(neighbor.test("neighbor"));

4. Date Type

   • Obj type 4 represent date
   • Create
     • new Date() -> current date and time
     • new Date(2016, 12, 9) -> specific time
   • feature
     • month start at 0 (December is 11)
     • Day numbers start at 1
     • Unix time
       • timestamp store number of millisecond since the start of 1970
       • negative number 4 times before 1970
       • Create-> new Date(1387407600000)

5. Pattern (xem anh)

   • http://www.w3schools.com/jsref/jsref_obj_regexp.asp