Regex that should exclude matched string

Question

please help me to write a regex that should exclude the matched pattern..
ex: i have a regex pattern A to match string A from the file
Note: the string A is not always same. it may change..
So the pattern A will match string A from the file, here i want to exclude that matched string and print remaining.
In Simple words:
whatever that pattern is matching it should be ignored.

Answer 1

/^A/ig

Answer 2

thank you for responding..
but my question is bit different
ex:
A= \d*\w*\s\d* is the pattern to match below lines from the file.
lines=123hareesh 456, 675hello 789,...so on..file also includes other data..
So whatever the pattern A is matching that should be avoided.
here in this case it should avoid first two lines.

Answer 3

For js, you can try str.split(regex).join("")

Here's the code:
https://code.sololearn.com/Wc27FWRa9YkH/?ref=app