Adapted from Semplice, following link from here.

[^x00-x80] matches any character not in the ASCII range.

Note that some of the characters may not be encoded correctly from the copy and paste.

var latin_map = {Á:A,Ă:A,Ắ:A,Ặ:A,Ằ:A,Ẳ:A,Ẵ:A,Ǎ:A,Â:A,Ấ:A,Ậ:A,Ầ:A,Ẩ:A,Ẫ:A,Ä:A,Ǟ:A,Ȧ:A,Ǡ:A,Ạ:A,Ȁ:A,À:A,Ả:A,Ȃ:A,Ā:A,Ą:A,Å:A,Ǻ:A,Ḁ:A,Ⱥ:A,Ã:A,Ꜳ:AA,Æ:AE,Ǽ:AE,Ǣ:AE,Ꜵ:AO,Ꜷ:AU,Ꜹ:AV,Ꜻ:AV,Ꜽ:AY,Ḃ:B,Ḅ:B,Ɓ:B,Ḇ:B,Ƀ:B,Ƃ:B,Ć:C,Č:C,Ç:C,Ḉ:C,Ĉ:C,Ċ:C,Ƈ:C,Ȼ:C,Ď:D,Ḑ:D,Ḓ:D,Ḋ:D,Ḍ:D,Ɗ:D,Ḏ:D,Dz:D,Dž:D,Đ:D,Ƌ:D,DZ:DZ,DŽ:DZ,É:E,Ĕ:E,Ě:E,Ȩ:E,Ḝ:E,Ê:E,Ế:E,Ệ:E,Ề:E,Ể:E,Ễ:E,Ḙ:E,Ë:E,Ė:E,Ẹ:E,Ȅ:E,È:E,Ẻ:E,Ȇ:E,Ē:E,Ḗ:E,Ḕ:E,Ę:E,Ɇ:E,Ẽ:E,Ḛ:E,Ꝫ:ET,Ḟ:F,Ƒ:F,Ǵ:G,Ğ:G,Ǧ:G,Ģ:G,Ĝ:G,Ġ:G,Ɠ:G,Ḡ:G,Ǥ:G,Ḫ:H,Ȟ:H,Ḩ:H,Ĥ:H,Ⱨ:H,Ḧ:H,Ḣ:H,Ḥ:H,Ħ:H,Í:I,Ĭ:I,Ǐ:I,Î:I,Ï:I,Ḯ:I,İ:I,Ị:I,Ȉ:I,Ì:I,Ỉ:I,Ȋ:I,Ī:I,Į:I,Ɨ:I,Ĩ:I,Ḭ:I,Ꝺ:D,Ꝼ:F,Ᵹ:G,Ꞃ:R,Ꞅ:S,Ꞇ:T,Ꝭ:IS,Ĵ:J,Ɉ:J,Ḱ:K,Ǩ:K,Ķ:K,Ⱪ:K,Ꝃ:K,Ḳ:K,Ƙ:K,Ḵ:K,Ꝁ:K,Ꝅ:K,Ĺ:L,Ƚ:L,Ľ:L,Ļ:L,Ḽ:L,Ḷ:L,Ḹ:L,Ⱡ:L,Ꝉ:L,Ḻ:L,Ŀ:L,Ɫ:L,Lj:L,Ł:L,LJ:LJ,Ḿ:M,Ṁ:M,Ṃ:M,Ɱ:M,Ń:N,Ň:N,Ņ:N,Ṋ:N,Ṅ:N,Ṇ:N,Ǹ:N,Ɲ:N,Ṉ:N,Ƞ:N,Nj:N,Ñ:N,NJ:NJ,Ó:O,Ŏ:O,Ǒ:O,Ô:O,Ố:O,Ộ:O,Ồ:O,Ổ:O,Ỗ:O,Ö:O,Ȫ:O,Ȯ:O,Ȱ:O,Ọ:O,Ő:O,Ȍ:O,Ò:O,Ỏ:O,Ơ:O,Ớ:O,Ợ:O,Ờ:O,Ở:O,Ỡ:O,Ȏ:O,Ꝋ:O,Ꝍ:O,Ō:O,Ṓ:O,Ṑ:O,Ɵ:O,Ǫ:O,Ǭ:O,Ø:O,Ǿ:O,Õ:O,Ṍ:O,Ṏ:O,Ȭ:O,Ƣ:OI,Ꝏ:OO,Ɛ:E,Ɔ:O,Ȣ:OU,Ṕ:P,Ṗ:P,Ꝓ:P,Ƥ:P,Ꝕ:P,Ᵽ:P,Ꝑ:P,Ꝙ:Q,Ꝗ:Q,Ŕ:R,Ř:R,Ŗ:R,Ṙ:R,Ṛ:R,Ṝ:R,Ȑ:R,Ȓ:R,Ṟ:R,Ɍ:R,Ɽ:R,Ꜿ:C,Ǝ:E,Ś:S,Ṥ:S,Š:S,Ṧ:S,Ş:S,Ŝ:S,Ș:S,Ṡ:S,Ṣ:S,Ṩ:S,Ť:T,Ţ:T,Ṱ:T,Ț:T,Ⱦ:T,Ṫ:T,Ṭ:T,Ƭ:T,Ṯ:T,Ʈ:T,Ŧ:T,Ɐ:A,Ꞁ:L,Ɯ:M,Ʌ:V,Ꜩ:TZ,Ú:U,Ŭ:U,Ǔ:U,Û:U,Ṷ:U,Ü:U,Ǘ:U,Ǚ:U,Ǜ:U,Ǖ:U,Ṳ:U,Ụ:U,Ű:U,Ȕ:U,Ù:U,Ủ:U,Ư:U,Ứ:U,Ự:U,Ừ:U,Ử:U,Ữ:U,Ȗ:U,Ū:U,Ṻ:U,Ų:U,Ů:U,Ũ:U,Ṹ:U,Ṵ:U,Ꝟ:V,Ṿ:V,Ʋ:V,Ṽ:V,Ꝡ:VY,Ẃ:W,Ŵ:W,Ẅ:W,Ẇ:W,Ẉ:W,Ẁ:W,Ⱳ:W,Ẍ:X,Ẋ:X,Ý:Y,Ŷ:Y,Ÿ:Y,Ẏ:Y,Ỵ:Y,Ỳ:Y,Ƴ:Y,Ỷ:Y,Ỿ:Y,Ȳ:Y,Ɏ:Y,Ỹ:Y,Ź:Z,Ž:Z,Ẑ:Z,Ⱬ:Z,Ż:Z,Ẓ:Z,Ȥ:Z,Ẕ:Z,Ƶ:Z,IJ:IJ,Œ:OE,ᴀ:A,ᴁ:AE,ʙ:B,ᴃ:B,ᴄ:C,ᴅ:D,ᴇ:E,ꜰ:F,ɢ:G,ʛ:G,ʜ:H,ɪ:I,ʁ:R,ᴊ:J,ᴋ:K,ʟ:L,ᴌ:L,ᴍ:M,ɴ:N,ᴏ:O,ɶ:OE,ᴐ:O,ᴕ:OU,ᴘ:P,ʀ:R,ᴎ:N,ᴙ:R,ꜱ:S,ᴛ:T,ⱻ:E,ᴚ:R,ᴜ:U,ᴠ:V,ᴡ:W,ʏ:Y,ᴢ:Z,á:a,ă:a,ắ:a,ặ:a,ằ:a,ẳ:a,ẵ:a,ǎ:a,â:a,ấ:a,ậ:a,ầ:a,ẩ:a,ẫ:a,ä:a,ǟ:a,ȧ:a,ǡ:a,ạ:a,ȁ:a,à:a,ả:a,ȃ:a,ā:a,ą:a,ᶏ:a,ẚ:a,å:a,ǻ:a,ḁ:a,ⱥ:a,ã:a,ꜳ:aa,æ:ae,ǽ:ae,ǣ:ae,ꜵ:ao,ꜷ:au,ꜹ:av,ꜻ:av,ꜽ:ay,ḃ:b,ḅ:b,ɓ:b,ḇ:b,ᵬ:b,ᶀ:b,ƀ:b,ƃ:b,ɵ:o,ć:c,č:c,ç:c,ḉ:c,ĉ:c,ɕ:c,ċ:c,ƈ:c,ȼ:c,ď:d,ḑ:d,ḓ:d,ȡ:d,ḋ:d,ḍ:d,ɗ:d,ᶑ:d,ḏ:d,ᵭ:d,ᶁ:d,đ:d,ɖ:d,ƌ:d,ı:i,ȷ:j,ɟ:j,ʄ:j,dz:dz,dž:dz,é:e,ĕ:e,ě:e,ȩ:e,ḝ:e,ê:e,ế:e,ệ:e,ề:e,ể:e,ễ:e,ḙ:e,ë:e,ė:e,ẹ:e,ȅ:e,è:e,ẻ:e,ȇ:e,ē:e,ḗ:e,ḕ:e,ⱸ:e,ę:e,ᶒ:e,ɇ:e,ẽ:e,ḛ:e,ꝫ:et,ḟ:f,ƒ:f,ᵮ:f,ᶂ:f,ǵ:g,ğ:g,ǧ:g,ģ:g,ĝ:g,ġ:g,ɠ:g,ḡ:g,ᶃ:g,ǥ:g,ḫ:h,ȟ:h,ḩ:h,ĥ:h,ⱨ:h,ḧ:h,ḣ:h,ḥ:h,ɦ:h,ẖ:h,ħ:h,ƕ:hv,í:i,ĭ:i,ǐ:i,î:i,ï:i,ḯ:i,ị:i,ȉ:i,ì:i,ỉ:i,ȋ:i,ī:i,į:i,ᶖ:i,ɨ:i,ĩ:i,ḭ:i,ꝺ:d,ꝼ:f,ᵹ:g,ꞃ:r,ꞅ:s,ꞇ:t,ꝭ:is,ǰ:j,ĵ:j,ʝ:j,ɉ:j,ḱ:k,ǩ:k,ķ:k,ⱪ:k,ꝃ:k,ḳ:k,ƙ:k,ḵ:k,ᶄ:k,ꝁ:k,ꝅ:k,ĺ:l,ƚ:l,ɬ:l,ľ:l,ļ:l,ḽ:l,ȴ:l,ḷ:l,ḹ:l,ⱡ:l,ꝉ:l,ḻ:l,ŀ:l,ɫ:l,ᶅ:l,ɭ:l,ł:l,lj:lj,ſ:s,ẜ:s,ẛ:s,ẝ:s,ḿ:m,ṁ:m,ṃ:m,ɱ:m,ᵯ:m,ᶆ:m,ń:n,ň:n,ņ:n,ṋ:n,ȵ:n,ṅ:n,ṇ:n,ǹ:n,ɲ:n,ṉ:n,ƞ:n,ᵰ:n,ᶇ:n,ɳ:n,ñ:n,nj:nj,ó:o,ŏ:o,ǒ:o,ô:o,ố:o,ộ:o,ồ:o,ổ:o,ỗ:o,ö:o,ȫ:o,ȯ:o,ȱ:o,ọ:o,ő:o,ȍ:o,ò:o,ỏ:o,ơ:o,ớ:o,ợ:o,ờ:o,ở:o,ỡ:o,ȏ:o,ꝋ:o,ꝍ:o,ⱺ:o,ō:o,ṓ:o,ṑ:o,ǫ:o,ǭ:o,ø:o,ǿ:o,õ:o,ṍ:o,ṏ:o,ȭ:o,ƣ:oi,ꝏ:oo,ɛ:e,ᶓ:e,ɔ:o,ᶗ:o,ȣ:ou,ṕ:p,ṗ:p,ꝓ:p,ƥ:p,ᵱ:p,ᶈ:p,ꝕ:p,ᵽ:p,ꝑ:p,ꝙ:q,ʠ:q,ɋ:q,ꝗ:q,ŕ:r,ř:r,ŗ:r,ṙ:r,ṛ:r,ṝ:r,ȑ:r,ɾ:r,ᵳ:r,ȓ:r,ṟ:r,ɼ:r,ᵲ:r,ᶉ:r,ɍ:r,ɽ:r,ↄ:c,ꜿ:c,ɘ:e,ɿ:r,ś:s,ṥ:s,š:s,ṧ:s,ş:s,ŝ:s,ș:s,ṡ:s,ṣ:s,ṩ:s,ʂ:s,ᵴ:s,ᶊ:s,ȿ:s,ɡ:g,ᴑ:o,ᴓ:o,ᴝ:u,ť:t,ţ:t,ṱ:t,ț:t,ȶ:t,ẗ:t,ⱦ:t,ṫ:t,ṭ:t,ƭ:t,ṯ:t,ᵵ:t,ƫ:t,ʈ:t,ŧ:t,ᵺ:th,ɐ:a,ᴂ:ae,ǝ:e,ᵷ:g,ɥ:h,ʮ:h,ʯ:h,ᴉ:i,ʞ:k,ꞁ:l,ɯ:m,ɰ:m,ᴔ:oe,ɹ:r,ɻ:r,ɺ:r,ⱹ:r,ʇ:t,ʌ:v,ʍ:w,ʎ:y,ꜩ:tz,ú:u,ŭ:u,ǔ:u,û:u,ṷ:u,ü:u,ǘ:u,ǚ:u,ǜ:u,ǖ:u,ṳ:u,ụ:u,ű:u,ȕ:u,ù:u,ủ:u,ư:u,ứ:u,ự:u,ừ:u,ử:u,ữ:u,ȗ:u,ū:u,ṻ:u,ų:u,ᶙ:u,ů:u,ũ:u,ṹ:u,ṵ:u,ᵫ:ue,ꝸ:um,ⱴ:v,ꝟ:v,ṿ:v,ʋ:v,ᶌ:v,ⱱ:v,ṽ:v,ꝡ:vy,ẃ:w,ŵ:w,ẅ:w,ẇ:w,ẉ:w,ẁ:w,ⱳ:w,ẘ:w,ẍ:x,ẋ:x,ᶍ:x,ý:y,ŷ:y,ÿ:y,ẏ:y,ỵ:y,ỳ:y,ƴ:y,ỷ:y,ỿ:y,ȳ:y,ẙ:y,ɏ:y,ỹ:y,ź:z,ž:z,ẑ:z,ʑ:z,ⱬ:z,ż:z,ẓ:z,ȥ:z,ẕ:z,ᵶ:z,ᶎ:z,ʐ:z,ƶ:z,ɀ:z,ff:ff,ffi:ffi,ffl:ffl,fi:fi,fl:fl,ij:ij,œ:oe,st:st,ₐ:a,ₑ:e,ᵢ:i,ⱼ:j,ₒ:o,ᵣ:r,ᵤ:u,ᵥ:v,ₓ:x};



function embolden( str, chr ){

    return str.replace( /[^x00-x80]/g,

        function (a) { 

            return chr == latin_map[a] ? '<b>' + a + '</b>' : a;

        } 

    );

}



embolden( 'ádám', 'a' );    // <b>á</b>d<b>á</b>m