两个不同字符串的单个正则表达式

Question

I need to write a single regular expression that returns the color value and size values from the below two strings.

[{"id":"2","name":"Color","code":"COLOR","optionValue":{"value":"TANGERINE TANGO","priority":0,"altValue1":"ORANGE","altValue2":null}},{"id":"3","name":"Size","code":"SIZE","optionValue":{"value":"MEDIUM","priority":4,"altValue1":null,"altValue2":null}}]

[{"id":"3","name":"Size","code":"SIZE","optionValue":{"value":"MEDIUM","priority":4,"altValue1":null,"altValue2":null}},{"id":"2","name":"Color","code":"COLOR","optionValue":{"value":"PEACOCK BLUE","priority":0,"altValue1":"GREEN","altValue2":null}}]

Currently I have two different regexps for them respectively.

1) COLOR(?:.*?)value":"([^"]+)(?:.*?)SIZE(?:.*?)value":"([^"]+)"
2) SIZE(?:.*?)value":"([^"]+)(?:.*?)COLOR(?:.*?)value":"([^"]+)"

Is there a way I can achieve this using a single regex?

Answer 1

Use JSON.parse , it is safer and is more appropriate with JSON strings:

 var strings = ['[{"id":"2","name":"Color","code":"COLOR","optionValue":{"value":"TANGERINE TANGO","priority":0,"altValue1":"ORANGE","altValue2":null}},{"id":"3","name":"Size","code":"SIZE","optionValue":{"value":"MEDIUM","priority":4,"altValue1":null,"altValue2":null}}]', '[{"id":"3","name":"Size","code":"SIZE","optionValue":{"value":"MEDIUM","priority":4,"altValue1":null,"altValue2":null}},{"id":"2","name":"Color","code":"COLOR","optionValue":{"value":"PEACOCK BLUE","priority":0,"altValue1":"GREEN","altValue2":null}}]']; var cnt = 0; strings.forEach(function(str) { var array = JSON.parse(str); cnt += 1; document.getElementById("r").innerHTML += "<b>Match " + cnt + "</b><br/>"; array.forEach(function(object) { document.getElementById("r").innerHTML += object.optionValue.value + "<br/>"; }); }); 

 <div id="r"/> 

You can declare an array and push the results you get into the array for later use.

Answer 2

Most compact way to do this in a single regex:

(COLOR|SIZE).*?value":"([^"]+).*?(?!\1)(?:COLOR|SIZE).*?value":"([^"]+)"

I might agree with @stribizhev and @Sirko about parsing the JSON, but I can see if you just need to get a quick-and-dirty job done, then a regex is sometimes useful.

Explanation:

You can use alternation , capturing , lookahead assertions , and backreferencing .

First, let's simplify your regex by removing unnecessary non-capturing groups, (?:...) :

COLOR.*?value":"([^"]+).*?SIZE.*?value":"([^"]+)"
SIZE.*?value":"([^"]+).*?COLOR.*?value":"([^"]+)"

Now, here's what gets you halfway (similar to @MarcosPerezGude's suggestion):

(?:COLOR|SIZE).*?value":"([^"]+).*?(?:COLOR|SIZE).*?value":"([^"]+)"
^^^     ^^^^^^                     ^^^^^^^^^    ^

But the problem with this is it accepts COLOR COLOR and SIZE SIZE . Here's how to get around that:

(  COLOR|SIZE).*?value":"([^"]+).*?(?!\1)(?:COLOR|SIZE).*?value":"([^"]+)"
 ^^                                ^^^^^^

Let me explain this. The \\1 is a backreference to whatever's captured in the first capturing group. Which in our case is now COLOR or SIZE because we've removed the non-capturing-ness. The (?!\\1) is a negative lookahead assertion that says, "As long as what comes next isn't \\1 ..." Therefore if the captured string was COLOR , the second half must be SIZE , or vice versa.

Answer 3

You can try with the OR operator

 ([size|color](?:.*?))

Good luck!

Answer 4

您应该能够让它在两个备选方案之间进行选择，如下所示：

COLOR(?:.*?)value":"([^"]+)(?:.*?)SIZE(?:.*?)value":"([^"]+)|SIZE(?:.*?)value":"([^"]+)(?:.*?)COLOR(?:.*?)value":"([^"]+)