Inline edge cases

Stray asterisk in the middle and a lone ! bang and a lone _ underscore. A trailing asterisk word and leading and middle and underscore words. Bang before bracket ![not an image because no paren] and real. Escaped * star, escaped _ under, escaped ` tick, escaped \ backslash.

Text with code with * and _ and [ inside should stay literal. Bold with code and should this nest inside end. Italic with a link inside and with code too.

Empty emphasis and and lone ** at start. Link text with query. Image inline.

A run of specials: _`[! mixed together. Multiple bold words again and em then em2* close together.

Unclosed *bold never closes here. Unclosed italic and `code both dangle.

Consecutive[[wikilink]]-style double brackets and normal link. Numbers 1234567890 and symbols !@#$%^&()+=~ with no markup.