Ruby Regular Expression Case Insensitive

A specific sequence of.

Ruby regular expression case insensitive.

In the following example we have a serial code with an initial letter that tells us how risky this product is to consume. While reading the rest of the site when in doubt you can always come back and look here. M makes the dot match newlines. The tables below are a reference to basic regex.

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. O causes any substitutions in a particular regex literal. Ruby indeed uses m whereas perl and many other programming languages use s for dot matches newlines. Wrap words show invisibles.

I case insensitive m make dot match newlines x ignore whitespace in regex o perform substitutions. I abc the most common modifiers are global case insensitive multiline and dotall modifiers. 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. Think about an email address with a ruby regex you can define what a valid email address looks like.

It s a handy way to test regular expressions as you write them. In other words your program will be able to tell. Rubular is a ruby based regular expression editor. 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.

A ruby regular expression editor. 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. 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. 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. X tells ruby to ignore whitespace between regex tokens. You can also use regular expressions as your when condition. I makes the regex match case insensitive.

Ruby case regex. Ruby supports the following modifiers.