Regular expression for function call containing two arguments-CodePudding

In many languages, a function call consists of a slug followed by any number of arguments surrounded by parentheses, like so:

my_function(); // no arguments
my_function(one_argument);
my_function(first_argument,second_argument);
my_function(first_argument,second_argument,third_argument);

What regular expression will match exactly the case with two arguments (the third case in the pseudocode above)?

The "obvious answer" would be something like \w $[^)] ,[^)] $. However, the special meaning of the parentheses breaks this expression.

CodePudding user response：

You might write the pattern like this using a negated character class and also omit matching the comma:

\w \([^,)] ,[^,)] \);

Explanation

\w Match 1 word chars
\( Match `(1
[^,)] Match 1 chars other than , and )
, Match the single comma
[^,)] Match 1 chars other than , and )
\); Match );

Regex demo

CodePudding user response：

Try:

/\w \([a-zA-Z_$][\w$]*, ?[a-zA-Z_$][\w$]*\);/g

RegEx101

Segment	Description
\w \([a-zA-Z_$]	Any letter, number, or underscore one or more times, then a literal `(`, then any letter, underscore, or dollar sign
[\w$]*, ?	Any letter, number, underscore, or dollar sign zero or more times, then a literal `,`, then a single space or nothing
[a-zA-Z_$][\w$]*\);	Any letter, underscore, or dollar sign, then any letter, number, underscore, or dollar sign zero or more times, then a literal `);`

Note that each parameter is [a-zA-Z_$][\w$]* which follows the rules for naming a JavaScript variable:

May consist of any letter, number, underscore, or dollar sign.
Must start with a letter, underscore, or dollar sign.

For a PHP variable: $[a-zA-Z_]\w*

For a Python variable: [a-zA-Z][a-zA-Z_]*