红宝石 | StringScanner 扫描函数

StringScanner#scan() : scan()是一个 StringScanner 类方法，它尝试与当前位置的模式匹配。

Syntax: StringScanner.scan()

Parameter: StringScanner values

Return: matched string otherwise return false

示例 #1：

# Ruby code for StringScanner.scan() method
  
# loading StringScanner
require 'strscan'
  
# declaring StringScanner 
c = StringScanner.new("Mon Sep 12 2018 14:39")
   
# scan() method
c.scan(/\w+/)
  
puts "String Scanner result of c.scan() form : #{c.pos()}\n\n"
  
# scan() method
c.scan(/\s+/)
  
puts "String Scanner result of c.scan() form : #{c.pos()}\n\n"

输出 ：

String Scanner result of c.scan() form : 3

String Scanner result of c.scan() form : 4

示例 #2：

# Ruby code for StringScanner.scan() method
  
# loading StringScanner
require 'strscan'
  
# declaring StringScanner 
c = StringScanner.new("h ello geeks")
   
# scan() method
c.scan(/\w+/)
  
puts "String Scanner result of c.scan() form : #{c.pos()}\n\n"
  
# scan() method
c.scan(/\s+/)
  
puts "String Scanner result of c.scan() form : #{c.pos()}\n\n"

输出 ：

String Scanner result of c.scan() form : 1

String Scanner result of c.scan() form : 2