初学JavaScript正则表达式(六)

JavaScript预定义类

ab+数字+任意字符

ab[0-9][^\r\n]      等价于  ab\d.

'@123@abc@'.replace(/@./g,'Q')      Q23Qbc@             将“@加任意字符”替换为“Q”

'@123@abc@'.replace(/^@./g,'Q')      Q23@abc@           将“以@加任意字符开头的”替换为“Q”

'@123@abc@'.replace(/.@$/g,'Q')      @123@abQ           将“以任意字符加@结束的”替换为“Q”

标识符m

var mulSrt = "@123\n@456\n@789"

mulSrt

     "@123

     @456

     @789

     "

mulSrt.replace(/@\d/g, "X")

     "X23

     X56

     X89 "

mulSrt.replace(/^@\d/g, "X")

     "X23

      @456

      @789 "

mulSrt.replace(/^@\d/gm, "X")

      "X23

       X56

       X89 "

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