6c1818fa46
In `convert_markdown_syntax`, `re.finditer` is used to iterate over each
`match` found in the `text`. In each iteration, we create the Zulip
formatting equivalent of the current `match` and do a `text.replace()`
to replace all strings in `text` that matches the current `match`.
Since we're planning to add the `re.MULTILINE` flag to `re.finditer`, it
would be problematic if the first and last capture group of `match` are
zero-width characters (newlines). This is because
`convert_markdown_syntax` would reformat all identical strike-through
and bold formatted strings as many time as there are identical `match`es
of them.
Consider the following:
---
original text: "*foo*\n*foo*"
1. <re.Match object; span=(0, 5), match='*foo*'>
1st replace -> "**foo**\n**foo**"
2. <re.Match object; span=(6, 11), match='*foo*'>
2nd replace -> "***foo***\n***foo***"
---
This commit uses `re.sub` instead of `re.finditer`, which does replace
operation only on the specific piece of the original text the `match` is
from.
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