getting error " The name can only contain underscores and alphanumeric characters. It must begin with a letter and be unique, and must not include spaces, end with an underscore, or contain
Solved Class variables can begin with letters, underscores ( | Chegg.com
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![MDL-16919] Administration: Allow username to contain an underscore - Moodle Tracker](https://tracker.moodle.org/secure/attachment/19044/upload_validation2.png "MDL-16919] Administration: Allow username to contain an underscore - Moodle Tracker")
MDL-16919] Administration: Allow username to contain an underscore - Moodle Tracker
![Machine Name element description should allow for cases where machine name uses hyphens [#3052479] | Drupal.org](https://www.drupal.org/files/issues/2019-05-03/417EDA62-F895-4FD0-BFF2-0B707C4E42A5.jpg "Machine Name element description should allow for cases where machine name uses hyphens [#3052479] | Drupal.org")
Machine Name element description should allow for cases where machine name uses hyphens [#3052479] | Drupal.org
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firebase realtime database - Invalid field name "Name ". Fields must contain only letters, numbers, and underscores, start with a letter or underscore, and be at most 128 char - Stack Overflow
Fix Instagram Username Can Only Use Letters Digits, Underscore And Full Stops. Problem Solve - YouTube
Anyone else had this problem before? | Fandom
Error: The name can only contain underscores and alphanumeric characters. It must begin with a letter and be unique, and must not include spaces, end with an underscore, or contain two consecutive
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android - Strange error in R.java, even after cleaning the project: "Underscores can only be used with source level 1.7 or greater" - Stack Overflow
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![Machine Name Can't Have Underscores [#3179779] | Drupal.org](https://www.drupal.org/files/issues/2020-10-29/action-name-space.png "Machine Name Can't Have Underscores [#3179779] | Drupal.org")
Machine Name Can't Have Underscores [#3179779] | Drupal.org
Study underscores that we can only learn what dogs are capable of from capable dogs. - National Canine Research Council
![MDL-16919] Administration: Allow username to contain an underscore - Moodle Tracker](https://tracker.moodle.org/secure/attachment/19043/upload_validation1.png "MDL-16919] Administration: Allow username to contain an underscore - Moodle Tracker")
MDL-16919] Administration: Allow username to contain an underscore - Moodle Tracker
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Usernames can only include letter,numbers,dashes,underscores, and periods - YouTube
