[Low Priority] Word Filter silently fails when an invalid regex is entered

The error originates in WordFilterModal.tsx at line 137 where a new RegExp is constructed. Start by examining the onSubmit handler around line 207. Add validation before creating the RegExp and display an error message to the user. Check the UI component library for how to show error modals. Test by entering invalid regex like '(' or '[' in the words filter modal.

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Does the issue happen when logged in?

Yes

Does the issue happen when logged out?

Yes

Does the issue happen in incognito mode when logged in?

Yes

Does the issue happen in incognito mode when logged out?

Yes

Account name

onedeath

Account config

Doesn't only happen when logged in, but just in case my config is
{"theme":"metaverse","themeLight":"serika","themeDark":"serika_dark","autoSwitchTheme":false,"customTheme":false,"customThemeColors":["#323437","#e2b714","#e2b714","#646669","#2c2e31","#d1d0c5","#ca4754","#7e2a33","#ca4754","#7e2a33"],"favThemes":["stealth","rgb","terminal","cyberspace","vscode","metaverse","matrix","shadow","midnight","dark","arch","husqy","dev"],"showKeyTips":true,"smoothCaret":"fast","codeUnindentOnBackspace":false,"quickRestart":"tab","punctuation":false,"numbers":false,"words":100,"time":15,"mode":"custom","quoteLength":[0,1,2,3],"language":"english","fontSize":2,"freedomMode":false,"difficulty":"normal","blindMode":false,"quickEnd":false,"caretStyle":"outline","paceCaretStyle":"outline","flipTestColors":false,"layout":"default","funbox":[],"confidenceMode":"off","indicateTypos":"off","compositionDisplay":"replace","timerStyle":"mini","liveSpeedStyle":"mini","liveAccStyle":"mini","liveBurstStyle":"mini","colorfulMode":false,"randomTheme":"off","timerColor":"main","timerOpacity":"1","stopOnError":"off","deleteOnError":"off","showAllLines":false,"keymapMode":"off","keymapStyle":"staggered","keymapLegendStyle":"lowercase","keymapLayout":"overrideSync","keymapKeys":"minimal","keymapSize":1,"fontFamily":"Kanit","smoothLineScroll":false,"alwaysShowDecimalPlaces":false,"alwaysShowWordsHistory":false,"singleListCommandLine":"on","capsLockWarning":true,"playSoundOnError":"off","playSoundOnClick":"off","soundVolume":0.5,"startGraphsAtZero":true,"showOutOfFocusWarning":true,"paceCaret":"off","paceCaretCustomSpeed":100,"repeatedPace":true,"accountChart":["on","on","on","on"],"minWpm":"off","minWpmCustomSpeed":100,"highlightMode":"letter","typedEffect":"keep","typingSpeedUnit":"wpm","ads":"result","hideExtraLetters":false,"strictSpace":false,"minAcc":"off","minAccCustom":90,"monkey":false,"repeatQuotes":"off","resultSaving":true,"oppositeShiftMode":"off","customBackground":"","customBackgroundSize":"cover","customBackgroundFilter":[0,1,1,1],"customLayoutfluid":["qwerty","dvorak"],"customPolyglot":["english","german"],"monkeyPowerLevel":"off","minBurst":"off","minBurstCustomSpeed":100,"burstHeatmap":false,"britishEnglish":false,"lazyMode":false,"showAverage":"off","showPb":false,"tapeMode":"off","tapeMargin":50,"maxLineWidth":0,"playTimeWarning":"off"}

Current Behavior

Entering an invalid regular expression in Custom Text → Word Filter and clicking Set or Add does nothing. No error message appears, no filter is applied, and the Word Filter modal remains open.

Honestly in my testing I've only tried the brackets '[' , ']' , and parentheses , '(' . ')', but I think other invalid regex should produce the same result.

Moreover, the Words Filter screen is unable to be opened until you refresh after you enter the invalid regex expression.

Expected Behavior

I expected the site to clearly show an error such as “Invalid regex expression” so the user knows why the filter was not applied. Instead the only error indicator is the lack of response when clicking Set or Add, or if you're a bit tech-savvy, the error in DevTools ->

WordFilterModal.tsx:137 Uncaught (in promise) SyntaxError: Invalid regular expression: /(/: Unterminated group
at new RegExp ()
at oM (WordFilterModal.tsx:137:18)
at Object.onSubmit (WordFilterModal.tsx:207:24)
at async Rg._handleSubmit (FormApi.js:561:9)

Steps To Reproduce

1. Go to the main screen
2. Enter the 'Custom' mode
3. Click change next to the mode selector
4. Click on the button with a funnel icon reading 'words filter'
5. In the regex field, put any invalid regex expression such as parentheses or brackets
6. No visible error modal

Environment

• OS: Windows 11
• Browser: Google Chrome
• Browser Version: 153.0.8010.54 (Official Build) (64-bit) (cohort: Control)

Anything else?

No response