Bash Strings¶

Dealing with strings is very common in writing code. But Bash is weird in the way that it works with strings. You’ve already seen the opal:str_equals and opal:str_unequals functions in the Bash Core file. You can read about string modification files below.

opal:str_length¶

Returns the length of a string.

@param String $title

@output Integer

$ opal:str_length "United States of America"
24

opal:str_lower¶

Replace uppercase letters with lowercase letters.

@param String $title

@output String

$ opal:str_lower "United States of America"
united states of america

opal:str_slug¶

Convert a string to a path friendly slug.

A slug consists of only letters, numbers, and hyphens so a string can be safely used is situations like file paths and URLs. Optionally, you can pass the second parameter to convert the slug to lowercase or uppercase.

@param String $content

@param String $style
Can be “lower” or “upper”

@output String

@uses sed

@uses iconv

$ opal:str_slug "There's Something Happening Here."
Theres-Something-Happening-Here

$ opal:str_slug "There's Something Happening Here." lower
theres-something-happening-here

$ opal:str_slug "There's Something Happening Here." upper
THERES-SOMETHING-HAPPENING-HERE

opal:str_trim¶

Remove the spaces from the start and end of a string.

@param String $title

@output String

@uses iconv

@uses sed

$ opal:str_trim " This  sentence  has A LOT of   extra spaces.  "
This  sentence  has A LOT of   extra spaces

opal:str_trimmer¶

Remove the spaces from the start and end of a string, and replaces multiple internal spaces with a single space.

@param String $title

@output String

@uses Opal:str_trim

@uses sed

$ opal:str_trimmer " This  sentence  has A LOT of   extra spaces  "
This sentence has A LOT of extra spaces

opal:str_upper¶

Replace lowercase letters with uppercase letters.

@param String $title

@return String

@uses tr

$ opal:str_lower "United States of America"
UNITED STATES OF AMERICA