Tier 6 · Adeptreplace

Strip The Commas

Remove the thousands separators from a number: 1,234,567.89 becomes 1234567.89.

The mirror image of inserting separators, and far easier: deleting is just replacing with nothing. Match the commas, replace with the empty string, and remember the g flag or only the first one goes. The decimal point is not a comma and must survive untouched.

literals replace formatting

Your pattern0 chars · par 2

Flags

Replacement — $1, $2 refer to your capture groups

Start typing — tests run as you go.

Test cases

1,234,567.89→ "1234567.89"
the full stop stays
1,000→ "1000"
12,345→ "12345"
42→ "42"
nothing to strip

+ 4 hidden tests, checked when you submit. They are what stops a pattern that only fits the examples above.