仅以字母开头的正则表达式不起作用

Question

I have the following JSFiddle where I am able to restrict the validation to numbers, characters, no spaces and underscores using this: regexp: /^[A-Za-z0-9_]+$/.

However, I want to start it using letter only and not with number or special character or anything else. I tried this: regexp: /^[a-zA-Z]+[A-Za-z0-9_]+$/, but it doesn't work.

What am I doing wrong here?

 $(document).ready(function() { function getConcepts() { var bootstrapValidator = $("#validateForm").data('bootstrapValidator'); bootstrapValidator.validate(); if (bootstrapValidator.isValid()) { $("#validateForm").submit(); console.log("Submitting form after validation"); } else { console.log("Bootstrap fields are not validated"); return; } } $("#conceptsButton").click(getConcepts); //BEGIN FORM Validations $('#validateForm').bootstrapValidator({ feedbackIcons: { valid: 'glyphicon glyphicon-ok', invalid: 'glyphicon glyphicon-remove', validating: 'glyphicon glyphicon-refresh' }, fields: { titleOfResearchProject: { validators: { stringLength: { min: 4, max: 10, message: 'Please Enter the title with minimum 4 & max 10 characters' }, notEmpty: { message: 'Please Enter title of your project' }, regexp: { //regexp: /^[\w]+$/, //regexp: /^[A-Za-z0-9_]+$/, regexp: /^[a-zA-Z]+[A-Za-z0-9_]+$/, message: 'You can introduce just alphabetical characters, underscore, number but no spaces' } } }, } }); //END FORM Validations });

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script> <:-- BEGIN Bootstrap form testing--> <form class="form-horizontal" id="validateForm"> <div class="row"> <div class="col-md-offset-1 col-md-4"> <div class="form-group"> </div> <div class="form-group"> </div> </div> <div class="col-md-offset-1 col-md-4"> <div class="form-group"> <label class="control-label">Title of your research project.</label> <input name="titleOfResearchProject" placeholder="Enter your title here...:" class="form-control" type="text"> </div> <div class="form-group"> </div> </div> </div> <button class="btn btn-success" id="conceptsButton">Request Data</button> </form> <div id="add_dialog" title="Add New Data" style="display;none;"> </div>

Answer 1

You can use the regex: ^[a-zA-Z].*\w+