JavaScript正则表达式符号出现

Question

I have some problem with regex in JS. I wrote my regular expression:

/^([A-Z]+)\s+([^\s]+)\s+([^\s]+)\s(\[.*\])\s+(.+)$/g

But it gives wrong result with one example:

WARN  2016-01-19 13:17:32,051 [localhost-startStop-1] Duplicate property values for key Data\ Df  : [ Date from] and [ Starting Day] 

I want regex to divide the string in a such parts:

WARN
2016-01-19
13:17:32,051
[localhost-startStop-1]
Duplicate property values for key Data\ Df  : [ Date from] and [ Starting Day]

And everything OK, except last 2 parts. There I got:

[localhost-startStop-1] Duplicate property values for key Data\ Df  : [ Date from]
and [ Starting Day]

Why? I want to divide that part of string by first ] occurrence. Don't know why it takes the second.

PS: Here is the example: https://regex101.com/r/wG5xV6/2

Thanks.

Answer 1

You need to restrict the .* (that matches zero or more characters other than a newline, as many as possible) with a lazy dot matching .*? that matches zero or more characters other than a newline, as few as possible:

^([A-Z]+)\s+([^\s]+)\s+([^\s]+)\s(\[.*?\])\s+(.+)$
                                    ^^^

See the regex demo

You can also shorten the pattern a bit by replacing [^\\s] with \\S :

^([A-Z]+)\s+(\S+)\s+(\S+)\s(\[.*?\])\s+(.+)$

Another demo

 var re = /^([AZ]+)\\s+(\\S+)\\s+(\\S+)\\s(\\[.*?\\])\\s+(.+)$/gm; var str = 'INFO 2016-01-20 08:03:21,113 [C3P0PooledConnectionPoolManager[identityToken->1bqu9pa9eq1cqr515yzwu7|6c240779]-HelperThread-#0] Connection to \\'rander\\' established. Notifying listeners...\\nWARN 2016-01-19 13:17:32,051 [localhost-startStop-1] Duplicate property values for key Data\\ Df : [ Date from] and [ Starting Day]'; while ((m = re.exec(str)) !== null) { document.body.innerHTML += "<pre>"+ JSON.stringify([m[1],m[2],m[3],m[4], m[5]], 0, 4) + "</pre>"; } 

Answer 2

You can try this:

• ^(.*?)(\\s*?)(\\S*?)(\\s*?)(\\S*?)(\\s*?)(\\[.*?\\])(\\s*)(.*?)$

Also change \\S with .

• \\S means not sapce.
• ? means get less.

• The rules of this sentence can be expressed as follows

  begin + word + space + word + space + word + space + word + space + word + end It must find first ] ,so we use ? to find it. if u want to change the format of this sentence,you can replace it use ($1)\\r($3)\\r($5)\\r($7)\\r($9) or other.