Javascript拆分正则表达式问题 [英] Javascript split regex question
问题描述
你好我正在尝试我认为在Javascript中相当容易的正则表达式,但是给了我很多麻烦。
我希望能够通过javascript分割来分割日期,分别是' - ','。','/'和''。
hello I am trying what I thought would be a rather easy regex in Javascript but is giving me lots of trouble. I want the ability to split a date via javascript splitting either by a '-','.','/' and ' '.
var date = "02-25-2010";
var myregexp2 = new RegExp("-.");
dateArray = date.split(myregexp2);
这个正确的正则表达式是什么,所有帮助都很棒。
What is the correct regex for this any and all help would be great.
推荐答案
你需要把你希望拆分的字符放在字符类,它告诉正则表达式引擎这些字符中的任何一个都匹配。为了您的目的,这看起来像:
You need the put the characters you wish to split on in a character class, which tells the regular expression engine "any of these characters is a match". For your purposes, this would look like:
date.split(/[.,\/ -]/)
虽然破折号在字符类中作为范围说明符具有特殊含义(即 [az]
与 [abcdefghijklmnopqrstuvwxyz]
相同,如果你把它作为课程中的最后一件事,它被认为是一个文字破折号并且不需要转义。
Although dashes have special meaning in character classes as a range specifier (ie [a-z]
means the same as [abcdefghijklmnopqrstuvwxyz]
), if you put it as the last thing in the class it is taken to mean a literal dash and does not need to be escaped.
要解释为什么你的模式不起作用, /-./
告诉正则表达式引擎匹配文字短划线字符后跟任何字符(点是通配符常用表达)。对于02-25-2010,每次遇到-2时它会分开,因为短划线匹配且点匹配2。
To explain why your pattern didn't work, /-./
tells the regular expression engine to match a literal dash character followed by any character (dots are wildcard characters in regular expressions). With "02-25-2010", it would split each time "-2" is encountered, because the dash matches and the dot matches "2".
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