CODEWITHSUNDEEP
phpregexpreg-matchpreg-match-all
user101289
user101289

Reputation: 10422

Optionally matching subgroup in regex

I have a SQL string I'm trying to match using PHP preg_match_all and I need to extract out the matches. It looks like this:

A BUNCH OF MEANINGLESS SQL And (Condition1 = 'thisvalue*' Or Condition1 = '8504577' Or Condition1 = 'somethingelse123*') And MORE MEANINGLESS SQL

I want to grab all those Condition1 = X parts and use them in a different area, but ONLY if they are in the larger sub-condition in parentheses and are connected by Ors.

My regex looks like this (https://www.regex101.com/r/gepdq9/3): 

/(\((Condition1 = '[\dA-Za-z]+\*?'(\sOr\s)?)+\))/

It matches the larger sub-condition correctly, but for some reason the matches[3] item, which I think should be capturing all the thisvalue*, 8504577 and somethingelse123* values, is only capturing the last one.

How can I capture all of these matches?

Upvotes: 0

Views: 132

Answers (1)

Shai Shprung
Shai Shprung

Reputation: 146

here is a sample code that will work for your example:

$a="A BUNCH OF MEANINGLESS SQL And (Condition1 = 'thisvalue*' Or Condition1 = '8504577' Or Condition1 = 'somethingelse123') And MORE MEANINGLESS SQL";
if (preg_match('/\((Condition1.*( Or )?)\) /',$a,$m)){
    print $m[1]; /* Condition1 = 'thisvalue*' Or Condition1 = '8504577' Or Condition1 = 'somethingelse123' */
}

it looking for the "(Condition1" that follow with " Or " 1 or 0 times. the 0 times is for that last one that don't have any more " Or " after it. follow by a ")" to capture them all. Next, because you are in PHP, if you want to remove all the " Or " and have each of the condition in its own var, do something like

$arr=explode(' Or ',$m[1]); /* "Condition1='thisvalue*'", "Condition1 = '8504577'",... */

If you want to break it all in regEx and see just the conditions values, you can try this:

$a="A BUNCH OF MEANINGLESS SQL And (Condition1 = 'thisvalue*' Or Condition1 = '8504577' Or Condition1 = 'somethingelse123') And MORE MEANINGLESS SQL";
if (preg_match_all("/Condition1 = '([^']+)'( Or )?/",$a,$m)){
    print_r($m[1]); /* [0] => thisvalue*    [1] => 8504577    [2] => somethingelse123 */
}

Upvotes: 1

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