A simple Python 3 class for matching a strings that have letters that only look the same as original string.
unicode.org provides a list of "confusable" letters. This class uses that confusables.txt file to turn a string into a regular expression
pattern that includes all these confusable variations.
E.g. "𝓗℮𝐥1೦" would match "Hello"
"Hello" gets turned into the following regex of character classes:
[HＨℋℌℍ𝐇𝐻𝑯𝓗𝕳𝖧𝗛𝘏𝙃𝙷Η𝚮𝛨𝜢𝝜𝞖ⲎНᎻᕼꓧ𐋏ⱧҢĦӉӇ]
[e℮ｅℯⅇ𝐞𝑒𝒆𝓮𝔢𝕖𝖊𝖾𝗲𝘦𝙚𝚎ꬲеҽɇҿ]
[l\u200e\\|∣⏽￨1\u200e۱𐌠\u200e𝟏𝟙𝟣𝟭𝟷IＩⅠℐℑ𝐈𝐼𝑰𝓘𝕀𝕴𝖨𝗜𝘐𝙄𝙸Ɩｌⅼℓ𝐥𝑙𝒍𝓁𝓵𝔩𝕝𝖑𝗅𝗹𝘭𝙡𝚕ǀΙ𝚰𝛪𝜤𝝞𝞘ⲒІӀ\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200eⵏᛁꓲ𖼨𐊊𐌉\u200e\u200ełɭƗƚɫ\u200e\u200e\u200e\u200eŀĿᒷ🄂⒈\u200e⒓㏫㋋㍤⒔㏬㍥⒕㏭㍦⒖㏮㍧⒗㏯㍨⒘㏰㍩⒙㏱㍪⒚㏲㍫ljIJ‖∥Ⅱǁ\u200e𐆙⒒Ⅲ𐆘㏪㋊㍣Ю⒑㏩㋉㍢ʪ₶ⅣⅨɮʫ㏠㋀㍙]
[l\u200e\\|∣⏽￨1\u200e۱𐌠\u200e𝟏𝟙𝟣𝟭𝟷IＩⅠℐℑ𝐈𝐼𝑰𝓘𝕀𝕴𝖨𝗜𝘐𝙄𝙸Ɩｌⅼℓ𝐥𝑙𝒍𝓁𝓵𝔩𝕝𝖑𝗅𝗹𝘭𝙡𝚕ǀΙ𝚰𝛪𝜤𝝞𝞘ⲒІӀ\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200eⵏᛁꓲ𖼨𐊊𐌉\u200e\u200ełɭƗƚɫ\u200e\u200e\u200e\u200eŀĿᒷ🄂⒈\u200e⒓㏫㋋㍤⒔㏬㍥⒕㏭㍦⒖㏮㍧⒗㏯㍨⒘㏰㍩⒙㏱㍪⒚㏲㍫ljIJ‖∥Ⅱǁ\u200e𐆙⒒Ⅲ𐆘㏪㋊㍣Ю⒑㏩㋉㍢ʪ₶ⅣⅨɮʫ㏠㋀㍙]
[oంಂംං०੦૦௦౦೦൦๐໐၀\u200e۵ｏℴ𝐨𝑜𝒐𝓸𝔬𝕠𝖔𝗈𝗼𝘰𝙤𝚘ᴏᴑꬽο𝛐𝜊𝝄𝝾𝞸σ𝛔𝜎𝝈𝞂𝞼ⲟоჿօ\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200e\u200eഠဝ𐓪𑣈𑣗𐐬\u200eøꬾɵꝋөѳꮎꮻꭴ\u200eơœɶ∞ꝏꚙൟတ]
(Note: Some characters above may not render in your browser correctly.)
Simple usage:
>>> from confusables import Confusables
>>> Confusables('confusables.txt').confusables_regex("A")
'[AＡ𝐀𝐴𝑨𝒜𝓐𝔄𝔸𝕬𝖠𝗔𝘈𝘼𝙰Α𝚨𝛢𝜜𝝖𝞐АᎪᗅꓮ𖽀𐊠ꜲÆӔꜴ🜇ꜶꜸꜺꜼ]'
It's probably best to combine this with removing accented characters in the text to be searched. Several ways explained here: https://stackoverflow.com/questions/517923/what-is-the-best-way-to-remove-accents-in-a-python-unicode-string