Regex to certain special characters -

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currently have following regex use validate name of company/industry , working fine

  /(?=[a-za-z0-9-]{5,25}$)^[a-za-z0-9]+(-[a-za-z0-9]+)*$/

the above regex doesnt supports special characters & - . _ valid in case

i came wasnt working expected. 

 /(?=[a-za-z0-9-\&\_\.]{5,25}$)^[a-za-z0-9\&\_\.]+(-[a-za-z0-9\&\_\.]+)*$/

can point out above regex goes wrong. short explaination of above regex wud appreciated thanks

i don't think have escape & \&, same way _ also

/(?=[a-za-z0-9-&_\.]{5,25}$)^[a-za-z0-9&_\.]+(-[a-za-z0-9&_\.]+)*$/

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