Javascript Regex Invalid Group

Question

Re-writing the question since named capturing groups are not the main issue.

/([a-zA-Z ]*)([0-9]*)/g

The code is working now fine but var m = /([a-zA-Z ]*)([0-9]*)/g.exec('Ashok : 9830011245') is only giving me the Ashok as the result.

m[0]: "Ashok"
m[1]: "Ashok"
m[2]: ""

Sample Strings I need to work it on:

var strings = [
"Ashok : 9812340245",
"Amit Singh :\nChakmir 9013123427\n\nHitendra Singh:\n\nM. : 9612348943",
"ANIL  AGARWAL :  \n09331234728\n09812340442\nMAYANK AGARWAL : \n09123416042",
"JAGDISH SINGH :      098123452187 \n09830111234",
"MD QYAMUDDIN : 09433186333,\n09477215123\nMD TAJUDDIN : \n09831429111\nGYASUDDIN ANSARI :\n08961383686 \nMD BABUDDIN : \n09433336456 \n09903568555\nJAWE",
"Viay Singh : 9330938789,\nBijay Singh : 9330938222",
"Nilu :          09830161000,\n09331863222,\n09830071333,\nSantosh Upadhayay :       09831379555,\n09331727858,\n09830593322"
];

Please guide.

does not support named capturing groups yet :p github.com/tc39/proposal-regexp-named-groups — Jaromanda X
– Jaromanda X, Commented Sep 20, 2017 at 8:32
@WiktorStribiżew I have removed the name but now my exec function is not returning the numeric group value at all. After Removing my named groups, the new regex is: /([a-zA-Z ]*)([0-9]*)/g. — Siddharth Srivastva
– Siddharth Srivastva, Commented Sep 20, 2017 at 8:41
Try ([a-zA-Z]+)\s*([0-9]+). Note you most probably have line breaks in the original string, not 2-char \ns. Note it is a very bad idea to use a regex that matches an empty string with a g modifier (like /([a-zA-Z ]*)([0-9]*)/g) - it might just cause an infinite loop. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Sep 20, 2017 at 8:43

Wiktor Stribiżew · Accepted Answer · 2017-09-20 10:13:22Z

It seems you may extract all the substrings you need with

/^([^:0-9\n]+)\s*(?::\s*)?([0-9]*)/gm

See the regex demo.

Details

^ - start of the line (as m enables the multiline mode)
([^:0-9\n]+) - 1 or more chars other than :, digits and newline
\s* - 1 or more whitespaces
(?::\s*)? - an optional sequence of : and 0+ whitespaces
([0-9]*) - zero or more digits.

JS demo:

var strings = [
"Ashok : 9812340245",
"Amit Singh :\nChakmir 9013123427\n\nHitendra Singh:\n\nM. : 9612348943",
"ANIL  AGARWAL :  \n09331234728\n09812340442\nMAYANK AGARWAL : \n09123416042",
"JAGDISH SINGH :      098123452187 \n09830111234",
"MD QYAMUDDIN : 09433186333,\n09477215123\nMD TAJUDDIN : \n09831429111\nGYASUDDIN ANSARI :\n08961383686 \nMD BABUDDIN : \n09433336456 \n09903568555\nJAWE",
"Viay Singh : 9330938789,\nBijay Singh : 9330938222",
"Nilu :          09830161000,\n09331863222,\n09830071333,\nSantosh Upadhayay :       09831379555,\n09331727858,\n09830593322"
];

var regex = /^([^:0-9\n]+)\s*(?::\s*)?([0-9]*)/gm;
for (var s of strings) {
  console.log("Looking in: ", s, "\n--------------------------");
	console.log(s.match(regex));
}
// To output groups:
console.log("====Outputting groups====");
for (var s of strings) {
	while(m=regex.exec(s))
    console.log(m[1].trim(), ";", m[2]);
}

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