fix #62: minimize incorrect matches for javascript function

[farhan443]

Address #47
Fix #62

Before

function\*?(\s+[$\w]+\s*\(.*\)|\s*\(.*\))

After

function\*?\s*([A-Za-z$_][\w$]*)?\s*[(][^:;()]*[)]\s*{

Replaced patterns:

• Wildcard ( . )
• Alternation ( | )
• Escaped meta character ( \meta )

This regex enforces the following:

• Function name can't start with a digit
• Parameters can't contain parentheses, colon and semicolon
• There must be an opening curly bracket after the closing parentheses

Known remaining issues:

• Doesn't match if the function name uses valid characters that are outside standard ASCII, e.g., accented letters, emoji, kanji, etc
• Parameter's name is still too permissive, currently it only disallows 4 characters ((, ), :, ;)

[codecov]

Codecov Report

Merging #63 (055387f) into master (009389b) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #63   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines          947       947           
  Branches        43        43           
=========================================
  Hits           947       947           

Impacted Files	Coverage Δ
src/languages/javascript.ts	100.00% <100.00%> (ø)

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