How to Highlight Specific Text Passages in a Tkinter Text Widget Based on Patterns?

Syntax Highlighting in Tkinter Text Widget

Question: How can I modify the style of specific text passages based on defined patterns?

Answer: The tkinter Text widget is suitable for this task. You can assign properties to tags and apply these tags to specific text ranges.

Method Details:

To find matching strings, use the text widget's search command. This will return information to apply a tag to the matched range.

For example:

<code class="python">import tkinter as tk

class CustomText(tk.Text):
    def highlight_pattern(self, pattern, tag, start="1.0", end="end",
                          regexp=False):
        # ... (See code snippet in original answer)</code>

In this script, 'pattern' must be a string (not a compiled regular expression) following Tcl's regular expression syntax.

To use this method:

1. Configure tag properties (e.g., specific foreground color).
2. Call the 'highlight_pattern' method to apply the tag to matching text.

For example:

<code class="python">text = CustomText()
text.tag_configure("red", foreground="#ff0000")
text.highlight_pattern("this should be red", "red")</code>

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