Regular Expressions

Examples of regular expressions to be used in some parts of Tiki

Tracker validation fields, such as text fields, allow to have some check against a regular expression. Some examples are:

Only records with more than 2 letters in the field are allowed:
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```
^.{3,}$
```
Only lowercase letters, numbers and dashes are allowed:
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```
^[a-z0-9\-]+$
```
Only lowercase letters in emails, therefore, letters, numbers, dots, dashes and underscores are allowed:
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```
^[a-z0-9.\@\-\_]+$
```
Or an alternative (and more permissive) approach: all except uppercase letters:
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```
^[^A-Z]+$
```
Numbers between 0 and 1 (very useful to validate probabilities):
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```
^((0(\.[0-9]*)?)|(1(\.0)?))$
```
Numbers between 0 and 100 (useful for positive values under and 3 digit threshold like 100):
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```
^[0-9]{1}$|^[0-9]{1}[0-9]{1}$|^[1]{1}[0]{1}[0]{1}$|^100$
```
Positive numbers or zero only (useful for measurements of concentrations of chemical substances, for instance):

In Tiki 12.x LTS
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```
^[0]{1}$|^(?!0*[.,]0*$|[.,]0*$|0*$)\\d+[,.]?\\d{0,2}$
```
Since Tiki 14.x
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```
^[0]{1}$|^(?!0*[.,]0*$|[.,]0*$|0*$)\d+[,.]?\d{0,2}$
```
Uppercase letter, two numbers, dash, two numbers (e.g.: X00-00)
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```
[A-Z][0-9][0-9]-[0-9][0-9]
```
Any user with the domain name ending with .example.com
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```
/(^[^@]*@[^,]*.example.com$)/
```

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