Splitting a string into multiple strings with equal length

There are many cases when you need to split a long text, string or any other content into a bunch of chunks with equal length. One of the cases is when you stream a certificate from a remote service and would like to validate a payload. Usually certificates are formatted as long strings without additional starting and ending tags. An example certificate could look like:

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

In order to format it properly you could perform a regular expression transformation like /.{1,64}/g and string concatenation similar to:

const certificate = `-----BEGIN CERTIFICATE-----\n${publicKey.x5c[0].match(/.{1,64}/g).join('\n')}\n-----END CERTIFICATE-----`;

which will produce the following nice looking certificate

-----BEGIN CERTIFICATE-----
MIICEjCCAXsCAg36MA0GCSqGSIb3DQEBBQUAMIGbMQswCQYDVQQGEwJKUDEOMAwG
A1UECBMFVG9reW8xEDAOBgNVBAcTB0NodW8ta3UxETAPBgNVBAoTCEZyYW5rNERE
MRgwFgYDVQQLEw9XZWJDZXJ0IFN1cHBvcnQxGDAWBgNVBAMTD0ZyYW5rNEREIFdl
YiBDQTEjMCEGCSqGSIb3DQEJARYUc3VwcG9ydEBmcmFuazRkZC5jb20wHhcNMTIw
ODIyMDUyNjU0WhcNMTcwODIxMDUyNjU0WjBKMQswCQYDVQQGEwJKUDEOMAwGA1UE
CAwFVG9reW8xETAPBgNVBAoMCEZyYW5rNEREMRgwFgYDVQQDDA93d3cuZXhhbXBs
ZS5jb20wXDANBgkqhkiG9w0BAQEFAANLADBIAkEAm/xmkHmEQrurE/0re/jeFRLl
8ZPjBop7uLHhnia7lQG/5zDtZIUC3RVpqDSwBuw/NTweGyuP+o8AG98HxqxTBwID
AQABMA0GCSqGSIb3DQEBBQUAA4GBABS2TLuBeTPmcaTaUW/LCB2NYOy8GMdzR1mx
8iBIu2H6/E2tiY3RIevV2OW61qY2/XRQg7YPxx3ffeUugX9F4J/iPnnu1zAxxyBy
2VguKv4SWjRFoRkIfIlHX0qVviMhSlNy2ioFLy7JcPZb+v3ftDGywUqcBiVDoea0
Hn+GmxZA
-----END CERTIFICATE-----