KaTeX parse error: Expected 'EOF'

Description:

Posting shell escape sequences brings a KaTeX parse error

Server Setup Information:

• Version of Rocket.Chat Server: 0.62.1
• Operating System: Debian GNU/Linux 9.4 (stretch)
• Deployment Method(snap/docker/tar/etc): snap
• Number of Running Instances: ?
• DB Replicaset Oplog: ?
• Node Version: v8.8.1
• mongoDB Version: ?

Steps to Reproduce:

Post something like
export PS1='\[\033[00;30m\]\[\033[47m\]\h [\D{%d.%m.%y} \t]\[\033[40m\] \[\033[01;33m\]\w \[\033[01;35m\]$ \[\033[00m\]'

Expected behavior:

Text should be shown as entered

Actual behavior:

you will get:

export PS1='
KaTeX parse error: Expected 'EOF', got '\0' at position 1: \̲0̲33[00;30m
KaTeX parse error: Expected 'EOF', got '\0' at position 1: \̲0̲33[47m
\h [\t]
KaTeX parse error: Expected 'EOF', got '\0' at position 1: \̲0̲33[40m
KaTeX parse error: Expected 'EOF', got '\0' at position 1: \̲0̲33[01;33m
\w
KaTeX parse error: Expected 'EOF', got '\0' at position 1: \̲0̲33[01;35m
$
KaTeX parse error: Expected 'EOF', got '\0' at position 1: \̲0̲33[00m
'

Reproduce the issue by posting the provided shell prompt in Rocket.Chat and inspect the message-rendering path where KaTeX parses the content. The fix is complete when the full escape sequence is displayed as entered without KaTeX parse errors; no file or test is named in the issue.