Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gi

Test String

Code Generator

Language

Generated Code

const regex = 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8[\udc00-\udf98]|\ud80c[\udc00-\udfff]|\ud80d[\udc00-\udc2e]|\ud81a[\udc00-\ude38\ude40-\ude5e\uded0-\udeed\udef0-\udef4\udf00-\udf36\udf40-\udf43\udf63-\udf77\udf7d-\udf8f]|\ud81b[\udf00-\udf44\udf50-\udf7e\udf8f-\udf9f]|\ud82c[\udc00\udc01]|\ud82f[\udc00-\udc6a\udc70-\udc7c\udc80-\udc88\udc90-\udc99\udc9d\udc9e]|\ud834[\udd65-\udd69\udd6d-\udd72\udd7b-\udd82\udd85-\udd8b\uddaa-\uddad\ude42-\ude44]|\ud835[\udc00-\udc54\udc56-\udc9c\udc9e\udc9f\udca2\udca5\udca6\udca9-\udcac\udcae-\udcb9\udcbb\udcbd-\udcc3\udcc5-\udd05\udd07-\udd0a\udd0d-\udd14\udd16-\udd1c\udd1e-\udd39\udd3b-\udd3e\udd40-\udd44\udd46\udd4a-\udd50\udd52-\udea5\udea8-\udec0\udec2-\udeda\udedc-\udefa\udefc-\udf14\udf16-\udf34\udf36-\udf4e\udf50-\udf6e\udf70-\udf88\udf8a-\udfa8\udfaa-\udfc2\udfc4-\udfcb]|\ud83a[\udc00-\udcc4\udcd0-\udcd6]|\ud83b[\ude00-\ude03\ude05-\ude1f\ude21\ude22\ude24\ude27\ude29-\ude32\ude34-\ude37\ude39\ude3b\ude42\ude47\ude49\ude4b\ude4d-\ude4f\ude51\ude52\ude54\ude57\ude59\ude5b\ude5d\ude5f\ude61\ude62\ude64\ude67-\ude6a\ude6c-\ude72\ude74-\ude77\ude79-\ude7c\ude7e\ude80-\ude89\ude8b-\ude9b\udea1-\udea3\udea5-\udea9\udeab-\udebb]|\ud840[\udc00-\udfff]|\ud841[\udc00-\udfff]|\ud842[\udc00-\udfff]|\ud843[\udc00-\udfff]|\ud844[\udc00-\udfff]|\ud845[\udc00-\udfff]|\ud846[\udc00-\udfff]|\ud847[\udc00-\udfff]|\ud848[\udc00-\udfff]|\ud849[\udc00-\udfff]|\ud84a[\udc00-\udfff]|\ud84b[\udc00-\udfff]|\ud84c[\udc00-\udfff]|\ud84d[\udc00-\udfff]|\ud84e[\udc00-\udfff]|\ud84f[\udc00-\udfff]|\ud850[\udc00-\udfff]|\ud851[\udc00-\udfff]|\ud852[\udc00-\udfff]|\ud853[\udc00-\udfff]|\ud854[\udc00-\udfff]|\ud855[\udc00-\udfff]|\ud856[\udc00-\udfff]|\ud857[\udc00-\udfff]|\ud858[\udc00-\udfff]|\ud859[\udc00-\udfff]|\ud85a[\udc00-\udfff]|\ud85b[\udc00-\udfff]|\ud85c[\udc00-\udfff]|\ud85d[\udc00-\udfff]|\ud85e[\udc00-\udfff]|\ud85f[\udc00-\udfff]|\ud860[\udc00-\udfff]|\ud861[\udc00-\udfff]|\ud862[\udc00-\udfff]|\ud863[\udc00-\udfff]|\ud864[\udc00-\udfff]|\ud865[\udc00-\udfff]|\ud866[\udc00-\udfff]|\ud867[\udc00-\udfff]|\ud868[\udc00-\udfff]|\ud869[\udc00-\uded6\udf00-\udfff]|\ud86a[\udc00-\udfff]|\ud86b[\udc00-\udfff]|\ud86c[\udc00-\udfff]|\ud86d[\udc00-\udf34\udf40-\udfff]|\ud86e[\udc00-\udc1d]|\ud87e[\udc00-\ude1d]|\udb40[\udd00-\uddef]))(?:[A-Za-z\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0300-\u0374\u0376\u0377\u037a-\u037d\u037f\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u0483-\u052f\u0531-\u0556\u0559\u0561-\u0587\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u05d0-\u05ea\u05f0-\u05f2\u0610-\u061a\u0620-\u065f\u066e-\u06d3\u06d5-\u06dc\u06df-\u06e8\u06ea-\u06ef\u06fa-\u06fc\u06ff\u0710-\u074a\u074d-\u07b1\u07ca-\u07f5\u07fa\u0800-\u082d\u0840-\u085b\u08a0-\u08b2\u08e4-\u0963\u0971-\u0983\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bc-\u09c4\u09c7\u09c8\u09cb-\u09ce\u09d7\u09dc\u09dd\u09df-\u09e3\u09f0\u09f1\u0a01-\u0a03\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a59-\u0a5c\u0a5e\u0a70-\u0a75\u0a81-\u0a83\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abc-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ad0\u0ae0-\u0ae3\u0b01-\u0b03\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3c-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b5c\u0b5d\u0b5f-\u0b63\u0b71\u0b82\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd0\u0bd7\u0c00-\u0c03\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c39\u0c3d-\u0c44\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c58\u0c59\u0c60-\u0c63\u0c81-\u0c83\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbc-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0cde\u0ce0-\u0ce3\u0cf1\u0cf2\u0d01-\u0d03\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d-\u0d44\u0d46-\u0d48\u0d4a-\u0d4e\u0d57\u0d60-\u0d63\u0d7a-\u0d7f\u0d82\u0d83\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0df2\u0df3\u0e01-\u0e3a\u0e40-\u0e4e\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb9\u0ebb-\u0ebd\u0ec0-\u0ec4\u0ec6\u0ec8-\u0ecd\u0edc-\u0edf\u0f00\u0f18\u0f19\u0f35\u0f37\u0f39\u0f3e-\u0f47\u0f49-\u0f6c\u0f71-\u0f84\u0f86-\u0f97\u0f99-\u0fbc\u0fc6\u1000-\u103f\u1050-\u108f\u109a-\u109d\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u135d-\u135f\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16f1-\u16f8\u1700-\u170c\u170e-\u1714\u1720-\u1734\u1740-\u1753\u1760-\u176c\u176e-\u1770\u1772\u1773\u1780-\u17d3\u17d7\u17dc\u17dd\u180b-\u180d\u1820-\u1877\u1880-\u18aa\u18b0-\u18f5\u1900-\u191e\u1920-\u192b\u1930-\u193b\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19b0-\u19c9\u1a00-\u1a1b\u1a20-\u1a5e\u1a60-\u1a7c\u1a7f\u1aa7\u1ab0-\u1abe\u1b00-\u1b4b\u1b6b-\u1b73\u1b80-\u1baf\u1bba-\u1bf3\u1c00-\u1c37\u1c4d-\u1c4f\u1c5a-\u1c7d\u1cd0-\u1cd2\u1cd4-\u1cf6\u1cf8\u1cf9\u1d00-\u1df5\u1dfc-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u20d0-\u20f0\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2183\u2184\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d7f-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2de0-\u2dff\u2e2f\u3005\u3006\u302a-\u302f\u3031-\u3035\u303b\u303c\u3041-\u3096\u3099\u309a\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua672\ua674-\ua67d\ua67f-\ua69d\ua69f-\ua6e5\ua6f0\ua6f1\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua7ad\ua7b0\ua7b1\ua7f7-\ua827\ua840-\ua873\ua880-\ua8c4\ua8e0-\ua8f7\ua8fb\ua90a-\ua92d\ua930-\ua953\ua960-\ua97c\ua980-\ua9c0\ua9cf\ua9e0-\ua9ef\ua9fa-\ua9fe\uaa00-\uaa36\uaa40-\uaa4d\uaa60-\uaa76\uaa7a-\uaac2\uaadb-\uaadd\uaae0-\uaaef\uaaf2-\uaaf6\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uab30-\uab5a\uab5c-\uab5f\uab64\uab65\uabc0-\uabea\uabec\uabed\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf870-\uf87f\uf882\uf884-\uf89f\uf8b8\uf8c1-\uf8d6\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe00-\ufe0f\ufe20-\ufe2d\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc0-9\u0660-\u0669\u06f0-\u06f9\u07c0-\u07c9\u0966-\u096f\u09e6-\u09ef\u0a66-\u0a6f\u0ae6-\u0aef\u0b66-\u0b6f\u0be6-\u0bef\u0c66-\u0c6f\u0ce6-\u0cef\u0d66-\u0d6f\u0de6-\u0def\u0e50-\u0e59\u0ed0-\u0ed9\u0f20-\u0f29\u1040-\u1049\u1090-\u1099\u17e0-\u17e9\u1810-\u1819\u1946-\u194f\u19d0-\u19d9\u1a80-\u1a89\u1a90-\u1a99\u1b50-\u1b59\u1bb0-\u1bb9\u1c40-\u1c49\u1c50-\u1c59\ua620-\ua629\ua8d0-\ua8d9\ua900-\ua909\ua9d0-\ua9d9\ua9f0-\ua9f9\uaa50-\uaa59\uabf0-\uabf9\uff10-\uff19_\u200c\u200d\ua67e\u05be\u05f3\u05f4\uff5e\u301c\u309b\u309c\u30a0\u30fb\u3003\u0f0b\u0f0c\xb7]|(?=[\uD800-\uDBFF][\uDC00-\uDFFF])(?:\ud800[\udc00-\udc0b\udc0d-\udc26\udc28-\udc3a\udc3c\udc3d\udc3f-\udc4d\udc50-\udc5d\udc80-\udcfa\uddfd\ude80-\ude9c\udea0-\uded0\udee0\udf00-\udf1f\udf30-\udf40\udf42-\udf49\udf50-\udf7a\udf80-\udf9d\udfa0-\udfc3\udfc8-\udfcf]|\ud801[\udc00-\udc9d\udd00-\udd27\udd30-\udd63\ude00-\udf36\udf40-\udf55\udf60-\udf67]|\ud802[\udc00-\udc05\udc08\udc0a-\udc35\udc37\udc38\udc3c\udc3f-\udc55\udc60-\udc76\udc80-\udc9e\udd00-\udd15\udd20-\udd39\udd80-\uddb7\uddbe\uddbf\ude00-\ude03\ude05\ude06\ude0c-\ude13\ude15-\ude17\ude19-\ude33\ude38-\ude3a\ude3f\ude60-\ude7c\ude80-\ude9c\udec0-\udec7\udec9-\udee6\udf00-\udf35\udf40-\udf55\udf60-\udf72\udf80-\udf91]|\ud803[\udc00-\udc48]|\ud804[\udc00-\udc46\udc7f-\udcba\udcd0-\udce8\udd00-\udd34\udd50-\udd73\udd76\udd80-\uddc4\uddda\ude00-\ude11\ude13-\ude37\udeb0-\udeea\udf01-\udf03\udf05-\udf0c\udf0f\udf10\udf13-\udf28\udf2a-\udf30\udf32\udf33\udf35-\udf39\udf3c-\udf44\udf47\udf48\udf4b-\udf4d\udf57\udf5d-\udf63\udf66-\udf6c\udf70-\udf74]|\ud805[\udc80-\udcc5\udcc7\udd80-\uddb5\uddb8-\uddc0\ude00-\ude40\ude44\ude80-\udeb7]|\ud806[\udca0-\udcdf\udcff\udec0-\udef8]|\ud808[\udc00-\udf98]|\ud80c[\udc00-\udfff]|\ud80d[\udc00-\udc2e]|\ud81a[\udc00-\ude38\ude40-\ude5e\uded0-\udeed\udef0-\udef4\udf00-\udf36\udf40-\udf43\udf63-\udf77\udf7d-\udf8f]|\ud81b[\udf00-\udf44\udf50-\udf7e\udf8f-\udf9f]|\ud82c[\udc00\udc01]|\ud82f[\udc00-\udc6a\udc70-\udc7c\udc80-\udc88\udc90-\udc99\udc9d\udc9e]|\ud834[\udd65-\udd69\udd6d-\udd72\udd7b-\udd82\udd85-\udd8b\uddaa-\uddad\ude42-\ude44]|\ud835[\udc00-\udc54\udc56-\udc9c\udc9e\udc9f\udca2\udca5\udca6\udca9-\udcac\udcae-\udcb9\udcbb\udcbd-\udcc3\udcc5-\udd05\udd07-\udd0a\udd0d-\udd14\udd16-\udd1c\udd1e-\udd39\udd3b-\udd3e\udd40-\udd44\udd46\udd4a-\udd50\udd52-\udea5\udea8-\udec0\udec2-\udeda\udedc-\udefa\udefc-\udf14\udf16-\udf34\udf36-\udf4e\udf50-\udf6e\udf70-\udf88\udf8a-\udfa8\udfaa-\udfc2\udfc4-\udfcb]|\ud83a[\udc00-\udcc4\udcd0-\udcd6]|\ud83b[\ude00-\ude03\ude05-\ude1f\ude21\ude22\ude24\ude27\ude29-\ude32\ude34-\ude37\ude39\ude3b\ude42\ude47\ude49\ude4b\ude4d-\ude4f\ude51\ude52\ude54\ude57\ude59\ude5b\ude5d\ude5f\ude61\ude62\ude64\ude67-\ude6a\ude6c-\ude72\ude74-\ude77\ude79-\ude7c\ude7e\ude80-\ude89\ude8b-\ude9b\udea1-\udea3\udea5-\udea9\udeab-\udebb]|\ud840[\udc00-\udfff]|\ud841[\udc00-\udfff]|\ud842[\udc00-\udfff]|\ud843[\udc00-\udfff]|\ud844[\udc00-\udfff]|\ud845[\udc00-\udfff]|\ud846[\udc00-\udfff]|\ud847[\udc00-\udfff]|\ud848[\udc00-\udfff]|\ud849[\udc00-\udfff]|\ud84a[\udc00-\udfff]|\ud84b[\udc00-\udfff]|\ud84c[\udc00-\udfff]|\ud84d[\udc00-\udfff]|\ud84e[\udc00-\udfff]|\ud84f[\udc00-\udfff]|\ud850[\udc00-\udfff]|\ud851[\udc00-\udfff]|\ud852[\udc00-\udfff]|\ud853[\udc00-\udfff]|\ud854[\udc00-\udfff]|\ud855[\udc00-\udfff]|\ud856[\udc00-\udfff]|\ud857[\udc00-\udfff]|\ud858[\udc00-\udfff]|\ud859[\udc00-\udfff]|\ud85a[\udc00-\udfff]|\ud85b[\udc00-\udfff]|\ud85c[\udc00-\udfff]|\ud85d[\udc00-\udfff]|\ud85e[\udc00-\udfff]|\ud85f[\udc00-\udfff]|\ud860[\udc00-\udfff]|\ud861[\udc00-\udfff]|\ud862[\udc00-\udfff]|\ud863[\udc00-\udfff]|\ud864[\udc00-\udfff]|\ud865[\udc00-\udfff]|\ud866[\udc00-\udfff]|\ud867[\udc00-\udfff]|\ud868[\udc00-\udfff]|\ud869[\udc00-\uded6\udf00-\udfff]|\ud86a[\udc00-\udfff]|\ud86b[\udc00-\udfff]|\ud86c[\udc00-\udfff]|\ud86d[\udc00-\udf34\udf40-\udfff]|\ud86e[\udc00-\udc1d]|\ud87e[\udc00-\ude1d]|\udb40[\udd00-\uddef]|\ud801[\udca0-\udca9]|\ud804[\udc66-\udc6f\udcf0-\udcf9\udd36-\udd3f\uddd0-\uddd9\udef0-\udef9]|\ud805[\udcd0-\udcd9\ude50-\ude59\udec0-\udec9]|\ud806[\udce0-\udce9]|\ud81a[\ude60-\ude69\udf50-\udf59]|\ud835[\udfce-\udfff]))*))/gi; // Alternative syntax using RegExp constructor // const regex = new 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0-\\uddef]|\\ud801[\\udca0-\\udca9]|\\ud804[\\udc66-\\udc6f\\udcf0-\\udcf9\\udd36-\\udd3f\\uddd0-\\uddd9\\udef0-\\udef9]|\\ud805[\\udcd0-\\udcd9\\ude50-\\ude59\\udec0-\\udec9]|\\ud806[\\udce0-\\udce9]|\\ud81a[\\ude60-\\ude69\\udf50-\\udf59]|\\ud835[\\udfce-\\udfff]))*))', 'gi') const str = `//only accept az AZ and _ (underscore) #teste_teste //underscore accepted #teste-teste //Hyphen not accepted #leof_gfg.sdfsd //dot not accepted #f34234@@45#6fgh6 // @ not accepted #leo#leo2#asd //followed hastag without space #6663 // only number accepted #asd_ // hashtag can't start or finish with underscore -#sdfsdf- // hashtag can't start or finish with hyphen .#sdfsdf. // hashtag can't start or finish with dot :#abcd ##le汉字o_leo__leo__leo___a123_leo //TO FIX: decline followed underline ^abc ＃啊啊啊啊 #啊啊啊啊`; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; while ((m = regex.exec(str)) !== null) { // This is necessary to avoid infinite loops with zero-width matches if (m.index === regex.lastIndex) { regex.lastIndex++; } // The result can be accessed through the `m`-variable. m.forEach((match, groupIndex) => { console.log(`Found match, group ${groupIndex}: ${match}`); }); }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions