Ruby Regular Expression Case Insensitive

Ruby regular expressions ruby regex for short help you find specific patterns inside strings with the intent of extracting data for further processing two common use cases for regular expressions include validation parsing.

Ruby regular expression case insensitive.

It you want a bookmark here s a direct link to the regex reference tables i encourage you to print the tables so you have a cheat sheet on your desk for quick reference. Ruby supports the following modifiers. 47 minutes to read 11. Regular expression patterns are often used with modifiers also called flags that redefine regex behavior regex modifiers can be regular e g.

Think about an email address with a ruby regex you can define what a valid email address looks like. While reading the rest of the site when in doubt you can always come back and look here. It s a handy way to test regular expressions as you write them. By default the comparison of an input string with any literal characters in a regular expression pattern is case sensitive white space in a regular expression pattern is interpreted as literal white space characters and capturing groups in a regular expression are named implicitly as well as explicitly.

You can also use regular expressions as your when condition. I abc the most common modifiers are global case insensitive multiline and dotall modifiers. I case insensitive m make dot match newlines x ignore whitespace in regex o perform substitutions. Abc i and inline or embedded e g.

In the following example we have a serial code with an initial letter that tells us how risky this product is to consume. In other words your program will be able to tell. Rubular is a ruby based regular expression editor. The tables below are a reference to basic regex.

Wrap words show invisibles. Regular expressions regex or regexp are extremely useful in extracting information from any text by searching for one or more matches of a specific search pattern i e. Case serial code when ac low risk when al medium risk when ax high risk else unknown risk end when not to use ruby case. M makes the dot match newlines.

Ruby indeed uses m whereas perl and many other programming languages use s for dot matches newlines. Your test string. O causes any substitutions in a particular regex literal. A specific sequence of.

I makes the regex match case insensitive. Constructs a new regular expression from pattern which can be either a string or a regexp in which case that regexp s options are propagated and new options may not be specified a change as of ruby 1 8.