编写正则表达式模式c ++

Question

Im trying to write a regex pattern that will match once it reads an assortment of characters (can be any length/size) and stops once it reaches an open parenthesis, '('.

For example if a string contains: "INSERT((address),(phone number))

It will match once it finds: INSERT(

My regex pattern looks like:

regex pattern1("^[.]*+\(");

What i'm trying to do here is use the '^' because it specifies a pattern must start at the beginning of a sequence.

[.]* to tell the computer that any character can be used any number of times.

and then the backslash( to signify the end of the pattern.

This is not working, would love if someone could help!

Answer 1

The pattern you wrote matches parentese too.

Look (base on your pattern):

1- First you should use ^ at the beginning of your pattern to force it starts with the next character. So up now:

^"

2- You should put an exception on parentese because . means every character include parentese. So:

^"[^\(]*

This section of pattern [^\\(] is saying any character except parentese.

3- And finally you should say the matches should end with a parentese. So:

^"[^\(]*\(

Regex101

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Notice: If you don't want that " included, you should use Groups . Look at this:

^"([^\(]*\()

Now you can access INSERT( on the second index of matched results.

Regex101