I am not good with regular expression patterns. I have to put a validation on an string, to allow

only alphabets, numbers, decimals, spaces, ma and underscore 

for allowing the alphabets and spaces I have /^[a-zA-Z][a-zA-Z\\s]+$/ Please help me in creating all the above conditions in one pattern.

Thanks

I am not good with regular expression patterns. I have to put a validation on an string, to allow

only alphabets, numbers, decimals, spaces, ma and underscore 

for allowing the alphabets and spaces I have /^[a-zA-Z][a-zA-Z\\s]+$/ Please help me in creating all the above conditions in one pattern.

Thanks

• c#
• java
• php
• javascript
• regex

• Not sure why you added a jQuery tag... And what is the difference between numbers and decimals. – PhiLho Commented Dec 26, 2012 at 13:34
• Is "decimals" the decimal point? I added it, just in case. – PhiLho Commented Dec 26, 2012 at 13:37

3 Answers 3

this regex should work for your requirements

'[a-zA-Z0-9_. ,]*'

In the regex, I specified the range a to z, A to Z (uppercase), 0 to 9 and the single character _, decimal point ".", space and a ma.

If you want to make sure you want at least one character after the first letter, you can replace the * with a +, or {2,} with at least 2 more characters, or {2,5} with between 2 and 5 characters.

You can try:

/^[\w., ]+$/

I don't know what are the requirements for the starting char, if there are any.

Rahul's answer gave me the direction to think, but for the visitors, may be this too can be helpfull

patternForClasName      =   /^([a-zA-Z0-9 _]+\.)*[a-zA-Z0-9 _]+$/;  
// Allowing valid className which has a format abcsasa.dsd.dsd(the class or a package name can have an underscore or a numerical)

patternForName          =   /^([a-zA-Z0-9 _-]+)$/;
// Allowing alphanumeric + spaces + (_)underscore and a (-)dash

patternForDescription   =   /^([a-zA-Z0-9 _-]+[\,\.]+)*[a-zA-Z0-9 _-]*$/;
  // Allowing alphanumeric,spaces, (_)underscore, (-)dash, ma, decimal

patternURLFormat        = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/;

// For a valid URL