Develop Reference

How to cover international lowercase word characters in a regex?

How do I cover all lowercase non-numeric word characters in a regex?
For example this would cover Müller for german umlauts
/[A-Z][a-zäöü-]+/g
...but what about french or spanish word characters? Is it possible to get those covered by a range or something like that?
The regex should NOT match a string which has multiple uppercase characters, like DOntGetMe. But it should match McDonald.
So I came up at the end with
/([A-Z][a-zäöü'-](?:[\w'-]+)?)/g
But it still don't cover french/spanish characters.
https://regex101.com/r/ofl4tj/2
Match
Smith
Müller
McDonald
O'Riley
Lee
Li
Manco-Johnson
Don't match
MIsspelled
ABC

Since you are looking for a letter from English alphabet as beginning of word use a word boundary \b right before [A-Z]. Using Unicode CLDR or Mother E**, to match all lowercase letters from all languages (\p{Ll}) this would be the regex:
(?:[a-z\xB5\xDF-\xF6\xF8-\xFF\u0101\u0103\u0105\u0107\u0109\u010B\u010D\u010F\u0111\u0113\u0115\u0117\u0119\u011B\u011D\u011F\u0121\u0123\u0125\u0127\u0129\u012B\u012D\u012F\u0131\u0133\u0135\u0137\u0138\u013A\u013C\u013E\u0140\u0142\u0144\u0146\u0148\u0149\u014B\u014D\u014F\u0151\u0153\u0155\u0157\u0159\u015B\u015D\u015F\u0161\u0163\u0165\u0167\u0169\u016B\u016D\u016F\u0171\u0173\u0175\u0177\u017A\u017C\u017E-\u0180\u0183\u0185\u0188\u018C\u018D\u0192\u0195\u0199-\u019B\u019E\u01A1\u01A3\u01A5\u01A8\u01AA\u01AB\u01AD\u01B0\u01B4\u01B6\u01B9\u01BA\u01BD-\u01BF\u01C6\u01C9\u01CC\u01CE\u01D0\u01D2\u01D4\u01D6\u01D8\u01DA\u01DC\u01DD\u01DF\u01E1\u01E3\u01E5\u01E7\u01E9\u01EB\u01ED\u01EF\u01F0\u01F3\u01F5\u01F9\u01FB\u01FD\u01FF\u0201\u0203\u0205\u0207\u0209\u020B\u020D\u020F\u0211\u0213\u0215\u0217\u0219\u021B\u021D\u021F\u0221\u0223\u0225\u0227\u0229\u022B\u022D\u022F\u0231\u0233-\u0239\u023C\u023F\u0240\u0242\u0247\u0249\u024B\u024D\u024F-\u0293\u0295-\u02AF\u0371\u0373\u0377\u037B-\u037D\u0390\u03AC-\u03CE\u03D0\u03D1\u03D5-\u03D7\u03D9\u03DB\u03DD\u03DF\u03E1\u03E3\u03E5\u03E7\u03E9\u03EB\u03ED\u03EF-\u03F3\u03F5\u03F8\u03FB\u03FC\u0430-\u045F\u0461\u0463\u0465\u0467\u0469\u046B\u046D\u046F\u0471\u0473\u0475\u0477\u0479\u047B\u047D\u047F\u0481\u048B\u048D\u048F\u0491\u0493\u0495\u0497\u0499\u049B\u049D\u049F\u04A1\u04A3\u04A5\u04A7\u04A9\u04AB\u04AD\u04AF\u04B1\u04B3\u04B5\u04B7\u04B9\u04BB\u04BD\u04BF\u04C2\u04C4\u04C6\u04C8\u04CA\u04CC\u04CE\u04CF\u04D1\u04D3\u04D5\u04D7\u04D9\u04DB\u04DD\u04DF\u04E1\u04E3\u04E5\u04E7\u04E9\u04EB\u04ED\u04EF\u04F1\u04F3\u04F5\u04F7\u04F9\u04FB\u04FD\u04FF\u0501\u0503\u0505\u0507\u0509\u050B\u050D\u050F\u0511\u0513\u0515\u0517\u0519\u051B\u051D\u051F\u0521\u0523\u0525\u0527\u0529\u052B\u052D\u052F\u0560-\u0588\u10D0-\u10FA\u10FD-\u10FF\u13F8-\u13FD\u1C80-\u1C88\u1D00-\u1D2B\u1D6B-\u1D77\u1D79-\u1D9A\u1E01\u1E03\u1E05\u1E07\u1E09\u1E0B\u1E0D\u1E0F\u1E11\u1E13\u1E15\u1E17\u1E19\u1E1B\u1E1D\u1E1F\u1E21\u1E23\u1E25\u1E27\u1E29\u1E2B\u1E2D\u1E2F\u1E31\u1E33\u1E35\u1E37\u1E39\u1E3B\u1E3D\u1E3F\u1E41\u1E43\u1E45\u1E47\u1E49\u1E4B\u1E4D\u1E4F\u1E51\u1E53\u1E55\u1E57\u1E59\u1E5B\u1E5D\u1E5F\u1E61\u1E63\u1E65\u1E67\u1E69\u1E6B\u1E6D\u1E6F\u1E71\u1E73\u1E75\u1E77\u1E79\u1E7B\u1E7D\u1E7F\u1E81\u1E83\u1E85\u1E87\u1E89\u1E8B\u1E8D\u1E8F\u1E91\u1E93\u1E95-\u1E9D\u1E9F\u1EA1\u1EA3\u1EA5\u1EA7\u1EA9\u1EAB\u1EAD\u1EAF\u1EB1\u1EB3\u1EB5\u1EB7\u1EB9\u1EBB\u1EBD\u1EBF\u1EC1\u1EC3\u1EC5\u1EC7\u1EC9\u1ECB\u1ECD\u1ECF\u1ED1\u1ED3\u1ED5\u1ED7\u1ED9\u1EDB\u1EDD\u1EDF\u1EE1\u1EE3\u1EE5\u1EE7\u1EE9\u1EEB\u1EED\u1EEF\u1EF1\u1EF3\u1EF5\u1EF7\u1EF9\u1EFB\u1EFD\u1EFF-\u1F07\u1F10-\u1F15\u1F20-\u1F27\u1F30-\u1F37\u1F40-\u1F45\u1F50-\u1F57\u1F60-\u1F67\u1F70-\u1F7D\u1F80-\u1F87\u1F90-\u1F97\u1FA0-\u1FA7\u1FB0-\u1FB4\u1FB6\u1FB7\u1FBE\u1FC2-\u1FC4\u1FC6\u1FC7\u1FD0-\u1FD3\u1FD6\u1FD7\u1FE0-\u1FE7\u1FF2-\u1FF4\u1FF6\u1FF7\u210A\u210E\u210F\u2113\u212F\u2134\u2139\u213C\u213D\u2146-\u2149\u214E\u2184\u2C30-\u2C5E\u2C61\u2C65\u2C66\u2C68\u2C6A\u2C6C\u2C71\u2C73\u2C74\u2C76-\u2C7B\u2C81\u2C83\u2C85\u2C87\u2C89\u2C8B\u2C8D\u2C8F\u2C91\u2C93\u2C95\u2C97\u2C99\u2C9B\u2C9D\u2C9F\u2CA1\u2CA3\u2CA5\u2CA7\u2CA9\u2CAB\u2CAD\u2CAF\u2CB1\u2CB3\u2CB5\u2CB7\u2CB9\u2CBB\u2CBD\u2CBF\u2CC1\u2CC3\u2CC5\u2CC7\u2CC9\u2CCB\u2CCD\u2CCF\u2CD1\u2CD3\u2CD5\u2CD7\u2CD9\u2CDB\u2CDD\u2CDF\u2CE1\u2CE3\u2CE4\u2CEC\u2CEE\u2CF3\u2D00-\u2D25\u2D27\u2D2D\uA641\uA643\uA645\uA647\uA649\uA64B\uA64D\uA64F\uA651\uA653\uA655\uA657\uA659\uA65B\uA65D\uA65F\uA661\uA663\uA665\uA667\uA669\uA66B\uA66D\uA681\uA683\uA685\uA687\uA689\uA68B\uA68D\uA68F\uA691\uA693\uA695\uA697\uA699\uA69B\uA723\uA725\uA727\uA729\uA72B\uA72D\uA72F-\uA731\uA733\uA735\uA737\uA739\uA73B\uA73D\uA73F\uA741\uA743\uA745\uA747\uA749\uA74B\uA74D\uA74F\uA751\uA753\uA755\uA757\uA759\uA75B\uA75D\uA75F\uA761\uA763\uA765\uA767\uA769\uA76B\uA76D\uA76F\uA771-\uA778\uA77A\uA77C\uA77F\uA781\uA783\uA785\uA787\uA78C\uA78E\uA791\uA793-\uA795\uA797\uA799\uA79B\uA79D\uA79F\uA7A1\uA7A3\uA7A5\uA7A7\uA7A9\uA7AF\uA7B5\uA7B7\uA7B9\uA7FA\uAB30-\uAB5A\uAB60-\uAB65\uAB70-\uABBF\uFB00-\uFB06\uFB13-\uFB17\uFF41-\uFF5A]|\uD801[\uDC28-\uDC4F\uDCD8-\uDCFB]|\uD803[\uDCC0-\uDCF2]|\uD806[\uDCC0-\uDCDF]|\uD81B[\uDE60-\uDE7F]|\uD835[\uDC1A-\uDC33\uDC4E-\uDC54\uDC56-\uDC67\uDC82-\uDC9B\uDCB6-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDCCF\uDCEA-\uDD03\uDD1E-\uDD37\uDD52-\uDD6B\uDD86-\uDD9F\uDDBA-\uDDD3\uDDEE-\uDE07\uDE22-\uDE3B\uDE56-\uDE6F\uDE8A-\uDEA5\uDEC2-\uDEDA\uDEDC-\uDEE1\uDEFC-\uDF14\uDF16-\uDF1B\uDF36-\uDF4E\uDF50-\uDF55\uDF70-\uDF88\uDF8A-\uDF8F\uDFAA-\uDFC2\uDFC4-\uDFC9\uDFCB]|\uD83A[\uDD22-\uDD43])
\b is not Unicode aware in JS so you can't use it for multi-byte letters - I'm not sure if you need it either. But if you do translate \p{L}\p{D} using above tools and use it in a negative lookahead (?!...) or simply do a (?!\S). The latter is more general but most of times satisfies the needs.

Find arabic words using regex

I using this pattern to find any word in the string:
\b(\w{1,})
but this can't find arabic words. How can I change this pattern to find both english and arabic words?
Thanks

Regex \w is an alias for A-z, 0-9, and _ (underscore) and will not match arabic unicode range. To include characters other than A-z you need to specify them, for example
[A-z\u0600-\u065F\u066A-\u06EF\u06FA-\u06FF]+
For explanation about character codes see Match Arabic word with regex that ends with “#”?

If your text only includes English and Arabic, and you want to sort the results, you could use this:
([^x00-\x7F ]+) for the Arabic text and this: (\w+) for the English text
The first part captures all characters other than the English set plus a space; the second part captures English characters (plus _).

Like smirnov said, that regex you're using will only find Latin strings. For Arabic you should use [\u0600-\u06ff]|[\u0750-\u077f]|[\ufb50-\ufbc1]|[\ufbd3-\ufd‌​3f]|[\ufd50-\ufd8f]|‌​[\ufd92-\ufdc7]|[\uf‌​e70-\ufefc]|[\uFDF0-‌​\uFDFD] (which should find all Arabic characters, even weird ones like ؁.)
Depending on what you're trying to do, you might want to split the string into a list and process it that way (that's what I usually end up doing when I'm dealing with mixed-language texts). Then you can identify the language of each word and process it accordingly.

Javascript regex character set restriction related query

I am using a JavaScript RegEx which is mentioned below:
^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*([-_.])).+$
This accepts only that text which has at least 1: uppercase letter, lowercase letter, number & a special symbol from .-_.
Now assume I supply User-123 as the user id which confirms to the above RegEx & I use the onscreen keyboard to type in a character from Finnish language, which results in User-123Ã.
The RegEx being fulfilled, the text is accepted by my JavaScript code, but I want it to only accept Alphanumeric input in English, and nothing else.
How should I enhance this RegEx to do so?

This string "User-123Ã" have contain Unicode "Ã" not alphabets, so how can identify js code,
[Code] [Glyph] [Decimal] [HTML] Description [#]
U+00C3 Ã Ã Ã Latin Capital letter A with tilde 0131
Try this link also,
How to find whether a particular string has unicode characters

I am not sure this will solve the issue, but in most cases when you want to restrict the input itself to some characters, your consuming pattern should only match those characters you allow. The lookahead restrictions just require or forbid certain characters to appear certain number of times at certain positions, but what you match in the consuming part is crucial.
.+$ allows all letters. Replace it with [\w.-]+$ (\w = [a-zA-Z0-9_]) instead to restrict to the characters you require in the lookaheads.

RegEx with extended latin alphabet (ä ö ü è ß)

I want to do some basic String testing in Node.js. Assume I have a form where users enter their name and I wanna check if it's just rubbish or a real name.
Happily (or sadly for my check) I get users from all around the world which means that their names contain non-english characters, like ä ö ü ß é. I was used to use /[A-Za-z -]{2,}/ but this doesn't match names like "Jan Buschtöns".
Do I have to manually add every possible non-english but latin character to my RegEx to work? I don't want a 100+ characters long RegEx like /[A-Za-z -äöüÄÖÜßéÉèÈêÊ...]{2,}/.

Check http://www.regular-expressions.info/unicode.html and http://xregexp.com/plugins/
You would need to use \p{L} to match any letter character if you want to include unicode.
Speaking unicode, alternative of \w is [\p{L}\p{N}_] then.

Update: As of ES2018, JavaScript supports Unicode property escapes such as \p{L}, which matches anything that Unicode considers to be a letter. All modern browsers support this feature, so that's probably the way to go as long as you don't care about ancient browsers.
Old answer for pre-ES2018 browsers:
The answer depends on exactly what you want to do.
As you have noticed, [A-Za-z] only matches Latin letters without diacritics.
If you only care about German diacritics and the ß ligature, then you can just replace that part with [A-Za-zÄÖÜäöüß], e.g.:
/[A-Za-zÄÖÜäöüß -]{2,}/
But that probably isn’t what you want to do. You probably want to match Latin letters with any diacritics, not just those used in German. Or perhaps you want to match any letters from any alphabet, not just Latin.
Other regular expression dialects have character classes to help you with problems like this, but unfortunately JavaScript’s regular expression dialect has very few character classes and none of them help you here.
(In case you don’t know, a “character class” is an expression that matches any character that is a member of a predefined group of characters. For example, \w is a character class that matches any ASCII letter, or digit, or an underscore, and . is a character class that matches any character.)
This means that you have to list out every range of UTF-16 code units that corresponds to a character that you want to match.
A quick and dirty solution might be to say [a-zA-Z\u0080-\uFFFF], or in full:
/[A-Za-z\\u0080-\\uFFFF -]{2,}/
This will match any letter in the ASCII range, but will also match any character at all that is outside the ASCII range. This includes all possible alphabetic characters with or without diacritics in any script. However, it also includes a lot of characters that are not letters. Non-letters in the ASCII range are excluded, but non-letters outside the ASCII range are included.
The above might be good enough for your purposes, but if it isn’t then you will have to figure out which character ranges you need and specify those explicitly.

If you want just Latin letters, including those with less common diacritics like åēį, but excluding e.g. Chinese, Devanagari, and Cyrillic characters, you can use \p{Script=Latin} with the u flag. This feature is called Unicode property escapes, and was introduced in ES2018.
For example, /\p{Script=Latin}+/u will match a word that only contains Latin characters.

This is a JavaScript/node.js question, but I barely see any actual JavaScript code which shows how to do it. Its a bit trickier, because it requires the Unicode "u" flag:
// Result: '_ {_} [_]'
'ulike {adj} [ubøyelig]'.replace(/\p{L}+/gu, '_')

I know this question is old but I'm working on some NPL software and I needed to match all words in most latin-like languages and I did this with the following piece of code.
let myString = "Whatever you want here, ex. Bân-lâm-gú or bokmål or Português or Română or Slovenčina or Slovenščina";
let wordchar = 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let re = new RegExp(`(?<=[^${wordchar}]*)[${wordchar}]+(?=[${wordchar}]*)`, "g");
console.log(myString.match(re)); // ["Whatever", "you", "want", "here", "ex", "Bân-lâm-gú", "or", "bokmål", "or", "Português", "or", "Română", "or", "Slovenčina", "or", "Slovenščina"]

For russian and latin alphabet I've used
[\\wа-яА-Я]

Regex to match card code input

How can I write a regex to match strings following these rules?
1 letter followed by 4 letters or numbers, then
5 letters or numbers, then
3 letters or numbers followed by a number and one of the following signs: ! & # ?
I need to allow input as a 15-character string or as 3 groups of 5 chars separated by one space.
I'm implementing this in JavaScript.

I'm not going to write out the whole regex for you since this is homework, but here are some hints which should help you out:
Use character classes. [A-Z] matches all uppercase. [a-z] matches all lowercase. [0-9] matches numbers. You can combine them like so [A-Za-z0-9].
Use quantifiers like {n} so [A-Z]{3} gives you 3 uppercase letters.
You can put other characters in character classes. Let's say you wanted to match % or # or #, you could do [%##] which would match any of those characters.
Some meta-characters (characters which have special meaning in the context of regular expressions) will need to be escaped like so: \$ (since $ matches the end of a line)
^ and $ match the beginning and end of the line respectively.
\s matches white-space, but if you sanitize your input, you shouldn't need to use this.
Flags after the regex do special things. For example in /[a-z]/i, the i ignores case.

This should be it:
/^[a-z][a-z0-9]{4} ?[a-z0-9]{5} ?[a-z0-9]{3}[0-9][!&#?]$/i
Feel free to change 0-9 and [0-9] with \d if you see fit.
The regex is simple and readable enough. ^ and $ make sure this is a whole match, so there aren't extra characters before or after the code, and the /i flag allows upper or lower case letters.

I would start with a tutorial.
Pay attention to the quantifiers (like {N}) and character classes (like [a-zA-Z])

^[a-zA-Z][a-zA-Z0-9]{4} ?[a-zA-Z0-9]{5} ?[a-zA-Z0-9]{3}[\!\&\#\?]$